Input event is event.one:

<ARRAY>
 <FlightService>
  <FltLeg EvtTs="20010205084813" EvtTyp="4117" Id="DL 001120010207LGW  ATL  01" ArlnCd="DL" FltNbr="11" FltOrgDt="20010207" DprtArptCd="LGW" ArrArptCd="ATL" IntInd="Y" SchldLOFSeqNbr="1" ActlLOFSeqNbr="1" FltTypCd="N" FltLegTypCd="O" DispchrId="32" LdPlnrId="BB" BlkTmAmt="575" MovInd="Y" IntBagScrtyCd="Y" FAMAvblInd="Y" OprgArlnId="DL">
   <FIDSArpt>
    <Arr> <ArptCd>LGW</ArptCd> </Arr>
    <Dprt> <ArptCd>ATL</ArptCd> </Dprt>
   </FIDSArpt>
   <Departure SchDprtGMTTm="20010207093500" DprtGMTDfrnc="0" DprtStCd="1" DprtSctrCd="I" DprtFIDSDsplyCd="B"></Departure>
   <Arrival SchArrGMTTm="20010207191000" ArrGMTDfrnc="18000" ArrStCd="1" ArrSctrCd="A" ArrFIDSDsplyCd="B"></Arrival>
   <FltLegAc IndstAcTypCd="777" DlAcTypCd="777"></FltLegAc>
   <Status OperlInd="Y"></Status>
   <Gate DprtGtCtrlCd="U" DprtGtId="OPS" DprtGtChgInd="Y" ArrGtId="E26" ArrGtChgInd="Y"></Gate>
   <Meal BusMealCd="L" CchMealCd="L"></Meal>
   <Capacity></Capacity>
  </FltLeg>
 </FlightService>
</ARRAY>

PBIO layout is:

numbers are:589, 589
offset 0:: 0x0000024d
numbers are:30741731, 30741731
offset 4:: 0x01d514e3
numbers are:-2100361973, -2100361973
offset 8:: 0x82cf050b
numbers are:32899072, 32899072
offset 12:: 0x01f60000
numbers are:573, 573
offset 16:: 0x0000023d
numbers are:1, 1
offset 20:: 0x00000001
numbers are:8, 8
offset 24:: 0x00000008
numbers are:0, 0
offset 28:: 0x00000000
numbers are:0, 0
offset 32:: 0x00000000
numbers are:0, 0
offset 36:: 0x00000000
numbers are:0, 0
offset 40:: 0x00000000
numbers are:0, 0
offset 44:: 0x00000000
numbers are:0, 0
offset 48:: 0x00000000
numbers are:0, 0
offset 52:: 0x00000000
numbers are:472, 472
offset 56:: 0x000001d8
numbers are:474, 474
offset 60:: 0x000001da
numbers are:0, 0
offset 64:: 0x00000000
numbers are:476, 476
offset 68:: 0x000001dc
numbers are:0, 0
offset 72:: 0x00000000
numbers are:480, 480
offset 76:: 0x000001e0
numbers are:-45538564, -45538564
offset 80:: 0xfd4922fc
numbers are:1, 1
offset 84:: 0x00000001
numbers are:0, 0
offset 88:: 0x00000000
numbers are:0, 0
offset 92:: 0x00000000
numbers are:0, 0
offset 96:: 0x00000000
numbers are:0, 0
offset 100:: 0x00000000
numbers are:484, 484
offset 104:: 0x000001e4
numbers are:486, 486
offset 108:: 0x000001e6
numbers are:488, 488
offset 112:: 0x000001e8
numbers are:-45441064, -45441064
offset 116:: 0xfd4a9fd8
numbers are:1, 1
offset 120:: 0x00000001
numbers are:0, 0
offset 124:: 0x00000000
numbers are:0, 0
offset 128:: 0x00000000
numbers are:0, 0
offset 132:: 0x00000000
numbers are:490, 490
offset 136:: 0x000001ea
numbers are:496, 496
offset 140:: 0x000001f0
numbers are:498, 498
offset 144:: 0x000001f2
numbers are:777, 777
offset 148:: 0x00000309
numbers are:777, 777
offset 152:: 0x00000309
numbers are:0, 0
offset 156:: 0x00000000
numbers are:0, 0
offset 160:: 0x00000000
numbers are:500, 500
offset 164:: 0x000001f4
numbers are:0, 0
offset 168:: 0x00000000
numbers are:0, 0
offset 172:: 0x00000000
numbers are:0, 0
offset 176:: 0x00000000
numbers are:0, 0
offset 180:: 0x00000000
numbers are:502, 502
offset 184:: 0x000001f6
numbers are:504, 504
offset 188:: 0x000001f8
numbers are:508, 508
offset 192:: 0x000001fc
numbers are:512, 512
offset 196:: 0x00000200
numbers are:514, 514
offset 200:: 0x00000202
numbers are:0, 0
offset 204:: 0x00000000
numbers are:0, 0
offset 208:: 0x00000000
numbers are:0, 0
offset 212:: 0x00000000
numbers are:0, 0
offset 216:: 0x00000000
numbers are:0, 0
offset 220:: 0x00000000
numbers are:0, 0
offset 224:: 0x00000000
numbers are:0, 0
offset 228:: 0x00000000
numbers are:0, 0
offset 232:: 0x00000000
numbers are:0, 0
offset 236:: 0x00000000
numbers are:0, 0
offset 240:: 0x00000000
numbers are:0, 0
offset 244:: 0x00000000
numbers are:0, 0
offset 248:: 0x00000000
numbers are:0, 0
offset 252:: 0x00000000
numbers are:0, 0
offset 256:: 0x00000000
numbers are:0, 0
offset 260:: 0x00000000
numbers are:0, 0
offset 264:: 0x00000000
numbers are:0, 0
offset 268:: 0x00000000
numbers are:0, 0
offset 272:: 0x00000000
numbers are:0, 0
offset 276:: 0x00000000
numbers are:0, 0
offset 280:: 0x00000000
numbers are:0, 0
offset 284:: 0x00000000
numbers are:0, 0
offset 288:: 0x00000000
numbers are:0, 0
offset 292:: 0x00000000
numbers are:0, 0
offset 296:: 0x00000000
numbers are:0, 0
offset 300:: 0x00000000
numbers are:0, 0
offset 304:: 0x00000000
numbers are:0, 0
offset 308:: 0x00000000
numbers are:0, 0
offset 312:: 0x00000000
numbers are:0, 0
offset 316:: 0x00000000
numbers are:-47547251, -47547251
offset 320:: 0xfd2a7c8d
numbers are:4117, 4117
offset 324:: 0x00001015
numbers are:11, 11
offset 328:: 0x0000000b
numbers are:20010207, 20010207
offset 332:: 0x013154df
numbers are:1, 1
offset 336:: 0x00000001
numbers are:1, 1
offset 340:: 0x00000001
numbers are:575, 575
offset 344:: 0x0000023f
numbers are:0, 0
offset 348:: 0x00000000
numbers are:0, 0
offset 352:: 0x00000000
numbers are:32, 32
offset 356:: 0x00000020
numbers are:0, 0
offset 360:: 0x00000000
numbers are:0, 0
offset 364:: 0x00000000
numbers are:0, 0
offset 368:: 0x00000000
numbers are:0, 0
offset 372:: 0x00000000
numbers are:0, 0
offset 376:: 0x00000000
numbers are:0, 0
offset 380:: 0x00000000
numbers are:0, 0
offset 384:: 0x00000000
numbers are:0, 0
offset 388:: 0x00000000
numbers are:0, 0
offset 392:: 0x00000000
numbers are:0, 0
offset 396:: 0x00000000
numbers are:0, 0
offset 400:: 0x00000000
numbers are:0, 0
offset 404:: 0x00000000
numbers are:0, 0
offset 408:: 0x00000000
numbers are:0, 0
offset 412:: 0x00000000
numbers are:0, 0
offset 416:: 0x00000000
numbers are:0, 0
offset 420:: 0x00000000
numbers are:516, 516
offset 424:: 0x00000204
numbers are:544, 544
offset 428:: 0x00000220
numbers are:547, 547
offset 432:: 0x00000223
numbers are:551, 551
offset 436:: 0x00000227
numbers are:555, 555
offset 440:: 0x0000022b
numbers are:557, 557
offset 444:: 0x0000022d
numbers are:559, 559
offset 448:: 0x0000022f
numbers are:561, 561
offset 452:: 0x00000231
numbers are:563, 563
offset 456:: 0x00000233
numbers are:566, 566
offset 460:: 0x00000236
numbers are:0, 0
offset 464:: 0x00000000
numbers are:569, 569
offset 468:: 0x00000239
numbers are:571, 571
offset 472:: 0x0000023b
numbers are:0, 0
offset 476:: 0x00000000
numbers are:0, 0
offset 480:: 0x00000000
numbers are:0, 0
offset 484:: 0x00000000
numbers are:0, 0
offset 488:: 0x00000000
numbers are:1275087872, 1275087872
offset 492:: 0x4c004c00
numbers are:1279743744, 1279743744
offset 496:: 0x4c475700
numbers are:1096043520, 1096043520
offset 500:: 0x41544c00
numbers are:805323264, 805323264
offset 504:: 0x30004200
numbers are:1224749368, 1224749368
offset 508:: 0x49003138
numbers are:808464384, 808464384
offset 512:: 0x30303000
numbers are:1107312896, 1107312896
offset 516:: 0x42004100
numbers are:1493193984, 1493193984
offset 520:: 0x59005500
numbers are:1330664192, 1330664192
offset 524:: 0x4f505300
numbers are:1160918528, 1160918528
offset 528:: 0x45323600
numbers are:1493195008, 1493195008
offset 532:: 0x59005900
numbers are:1145839664, 1145839664
offset 536:: 0x444c2030
numbers are:808530226, 808530226
offset 540:: 0x30313132
numbers are:808464688, 808464688
offset 544:: 0x30303130
numbers are:842020684, 842020684
offset 548:: 0x3230374c
numbers are:1196892192, 1196892192
offset 552:: 0x47572020
numbers are:1096043552, 1096043552
offset 556:: 0x41544c20
numbers are:540029184, 540029184
offset 560:: 0x20303100
numbers are:1145831500, 1145831500
offset 564:: 0x444c004c
numbers are:1196884033, 1196884033
offset 568:: 0x47570041
numbers are:1414266969, 1414266969
offset 572:: 0x544c0059
numbers are:5111887, 5111887
offset 576:: 0x004e004f
numbers are:5832772, 5832772
offset 580:: 0x00590044
numbers are:1275085378, 1275085378
offset 584:: 0x4c004242
offset 589:: 0x00


-----
byte

  0: total size of event - 589 (4B)
  4: format ID for ARRAY (10B + 2B padding) 0x01d514e3
  8: 0x82cf050b
 12: 0x01f60000 (value is: 01d514e382cf050b01f6)
 16: size of PBIO data: 573 (589 - 16)
 20: actual PBIO data starts, 1st field in ARRAY: FlightService_count: 1
 24: FlightService: offset into pbio data: 8B base size of ARRAY, this is first, so value is: 8 (offset count start at byte 20, so this will start at byte 28)
 28: FlightService starts: 1st field: FltLeg of size 464: 
     FltLeg start: 1st field: 
     Meal starts: (36B)
     Meal_FrstClsMealCnt: 0 - not set
 32: Meal_BusClsMealCnt: 0 - not set
 36: Meal_FrstClsSpecMealCnt: 0
 40: Meal_CchClsMealCnt: 0
 44: Meal_CchClsSpecMealCnt: 0
 48: Meal_BusClsSpecMealCnt: 0
 52: Meal_FrstMealCd: 0 (is string but not set so 0)
 56: Meal_BusMealCd "string": 472 - offset to where string actually is: 464 size of FltLeg + 8B it's original offset, so 1st free area is at 472 (it's size should be interpreted by the application)
 60: Meal_CchMealCd "string": 474 (means string was 2B, which is fine, since string is 'L' in both cases - check value at offset 472+20 (where we started writing PBIO data) = 492: 0x4c004c00 ("L""L")
 64: FIDSArpt starts: 
     Arr starts: 
     ArptCd_count: 0 - not set
 68: ArptCd "string": 476 (offset) actual value "LGW"
 72: Dprt starts:
     ArptCd_count: 0 - not set
 76: ArptCd "string": 480 (offset) ac. value "ATL"
 80: Departure starts: 
     Departure_SchDprtGMTTm "integer": 0xfd4922fc
 84: Departure_DprtStCd "integer": 1
 88: Departure_ActDprtGMTTm "integer": 0
 92: Departure_EstDprtGMTTm "integer": 0
 96: Departure_RdyToDprtGMTTs "integer": 0
100: Departure_FAAEstDprtGMTTm "integer": 0
104: Departure_DprtGMTDfrnc "string": 484 (offset) ac. value '0'
108: Departure_DprtFIDSDsplyCd "string": 486 ac. value 'B' 
112: Departure_DprtSctrCd "string": 488 ac. value 'I'
116: Arrival starts:
     Arrival_SchArrGMTTm "integer": 0xfd4a9fd8
120: Arrival_ArrStCd "integer": 1
124: Arrival_EstArrGMTTm "integer": 0
128: Arrival_ActArrGMTTm "integer": 0
132: Arrival_FAAEstArrGMTTm "integer": 0
136: Arrival_ArrGMTDfrnc "string": 490 (offset) value '18000'
140: Arrival_ArrFIDSDsplyCd "string": 496 (offset) value 'B'
144: Arrival_ArrSctrCd "string": 498 (offset) value 'A'
148: FltLegAc starts:
     FltLegAc_IndstAcTypCd "integer": 777
152: FltLegAc_DlAcTypCd "integer": 777
156: FltLegAc_ShipNbr "integer": 0 - not set
160: Status starts: 
     Status_RdyToDprtInd "string": 0 
164: Status_OperlInd "string": 500 (offset) ac. value "Y"
168: Status_RtnInd "string": 0
172: Status_CxInd "string": 0
176: Status_StubInd "string": 0
180: Status_NotOperlInd "string": 0
184: Gate starts:
     Gate_DprtGtCtrlCd "string": 502 - "U"
188: Gate_DprtGtId "string": 504 - "OPS"
192: Gate_ArrGtId "string": 508 - "E26"
196: Gate_ArrGtChgInd "string": 512 - "Y"
200: Gate_DprtGtChgInd "string": 514 - "Y"
204: Gate_PblcDprtGt "string": 0
208: Gate_PblcArrGt "string": 0
212: Capacity starts:
     BlkdSeat starts:
     CchCls starts:
     SeatId_count: 0
216: SeatId "string": 0
220: BusCls starts:
     SeatId_count: 0
224: SeatId "string" 0
228: FrstCls starts:
     SeatId_count: 0
232: SeatId "string" 0
236: BrknSeat starts: 
     CchCls starts:
     SeatId_count: 0
240: SeatId "string": 0
244: BusCls starts:
     SeatId_count: 0
248: SeatId "string" 0
252: FrstCls starts:
     SeatId_count: 0
256: SeatId "string" 0
260: Capacity_BusClsOperSeatCnt "integer"; size = 4; offset = 48
264: Capacity_CchClsOperSeatCnt "integer"; size = 4; offset = 52
268: Capacity_AcCchClsSeatCnt "integer"; size = 4; offset = 56
272: Capacity_FrstClsOperSeatCnt "integer"; size = 4; offset = 60
276: Capacity_AcFrstClsSeatCnt "integer"; size = 4; offset = 64
280: Capacity_AcBusClsSeatCnt "integer"; size = 4; offset = 68
284: Capacity_CchClsSeatCnt "integer"; size = 4; offset = 72
288: Capacity_BusClsSeatCnt "integer"; size = 4; offset = 76
292: Capacity_FrstClsSeatCnt "integer"; size = 4; offset = 80
296: Capacity_PNCICchClsSeatCnt "integer"; size = 4; offset = 84
300: Capacity_PNCIFrstClsSeatCnt "integer"; size = 4; offset = 88
304: Capacity_ShipNbrForSeatCnt "string"; size = 4; offset = 92
308: Capacity_PNCIActveStt "string"; size = 4; offset = 96 
312: MbrFltLeg starts: 
     Id_count "integer": 0
316: Id "Id[Id_count]"; size = 4; offset = 4
     Id_FltLegTypCd "string": 0
320: FltLeg_EvtTs "integer": 0xfd2a7c8d
324: FltLeg_EvtTyp "integer": 4117
328: FltLeg_FltNbr "integer": 11
332: FltLeg_FltOrgDt "integer": 20010207 (0x013154df)
336: FltLeg_SchldLOFSeqNbr "integer": 1
340: FltLeg_ActlLOFSeqNbr "integer": 1
344: FltLeg_BlkTmAmt "integer": 575
348: FltLeg_CASSEvntTs "integer": 0
352: FltLeg_TurnTmAmt "integer": 0
356: FltLeg_DispchrId "integer": 32
360: FltLeg_DprtBagPierId "integer": 0
364: FltLeg_CnnctBagZn "integer": 0
368: FltLeg_ActOffGMTTm "integer": 0
372: FltLeg_ActOnGMTTm "integer"; size = 4; offset = 344
376: FltLeg_CxGMTTm "integer"; size = 4; offset = 348
380: FltLeg_OnlnTm "integer"; size = 4; offset = 352
384: FltLeg_OfflnDragOffTm "integer"; size = 4; offset = 356
388: FltLeg_MtcRdyGMTTm "integer"; size = 4; offset = 360
392: FltLeg_EstOffTm "integer"; size = 4; offset = 364
396: FltLeg_BagWght "integer"; size = 4; offset = 368
400: FltLeg_FrstClsPsngrCnt "integer"; size = 4; offset = 372
404: FltLeg_CchClsPsngrCnt "integer"; size = 4; offset = 376
408: FltLeg_CargoWght "integer"; size = 4; offset = 380
412: FltLeg_BusClsPsngrCnt "integer"; size = 4; offset = 384
416: FltLeg_TRACONEnterGMTTm "integer"; size = 4; offset = 388
420: FltLeg_OutrMarkrGMTTm "integer"; size = 4; offset = 392
424: FltLeg_Id "string": 516 - "DL 001120010207LGW  ATL  01"
428: FltLeg_ArlnCd "string": 544 - "DL"
432: FltLeg_DprtArptCd "string": 547 - "LGW"
436: FltLeg_ArrArptCd "string": 551 - "ATL"
440: FltLeg_IntInd "string": 555 - "Y"
444: FltLeg_FltTypCd "string": 557 - "N"
448: FltLeg_FltLegTypCd "string": 559 - "O"
452: FltLeg_FAMAvblInd "string": 561 - "Y"
456: FltLeg_OprgArlnId "string": 563 - "DL"
460: FltLeg_LdPlnrId "string": 566 - "BB"
464: FltLeg_SpcEmphsInd "string": 0
468: FltLeg_IntBagScrtyCd "string": 569 - "Y"
472: FltLeg_MovInd "string": 571 - "Y"
476: FltLeg_CdshrInd "string": 0
480: FltLeg_EqpChgInd "string": 0
484: FltLeg_CARInd "string": 0
488: FltLeg_DragOffLoc "string": 0 (there is also some padding here 4B)


at next location 492 'vaiable data' starts... all offsets indicated by the "pointers" in the 'base data', need to be increased by 20, since the offset count starts with 0 being the first byte after header, which is 20.

492: 0x4c004c00 - "L""L"
496: 0x4c475700 -"LGW"
500: 0x41544c00 - "ATL"
504: 0x30004200 - "0""B"
508: 0x49003138 - "I" "18 - continues in 4B below
512: 0x30303000 - 000"
516: 0x42004100 - "B""A"
520: 0x59005500 - "Y""U"
524: 0x4f505300 - "OPS"
528: 0x45323600 - "E26"
532: 0x59005900 - "Y""Y"
536: 0x444c2030 - "DL 0 ("DL 001120010207LGW  ATL  01")
540: 0x30313132 - 0112
544: 0x30303130 - 0010
548: 0x3230374c - 207L
552: 0x47572020 - GW   (there are 2 blanks here)
556: 0x41544c20 - ATL  (there is one blank here)
560: 0x20303100 -  01" (there is one leading blank here)
564: 0x444c004c - "DL""L
568: 0x47570041 - "GW""A
572: 0x544c0059 - TL""Y
576: 0x004e004f - ""N""O
580: 0x00590044 - ""Y""D
584: 0x4c004242 - L""BB
589: 0x00590059 - ""Y""Y
592: 0x00       - "

total size of in_data is 593B - i.e. 589B encoded data + 4B it's size as leading info before header starts.