There can be different kinds of flight segments, all of them have similar syntax:
3PEBVO:
H-005;003OCPH;COPENHAGEN ;MXP;MILAN MALPENSA ;LH 6189 U U 28OCT0825 1035 28OCT;OK02;HK02;G
;0;321;;;20K;3 ;0725 ;ET;0210 ;N;711;DK;IT;1
LV7VC5.0:
01\1\0*LH3121\W\BLL03MAR1105A\FRA03MAR1240P\03MAR\03MAR\2PC\OKSO\143\WLNNDK\395\*\1.35\*\*\1
DOODTW.0:
M3011 0HK26NOVAIRNCPHCOPENHAGEN LHRLONDON HEATHROW SK 501O 0730 0835 2.05 B 000 321000594 00TERMINAL 3 TERMINAL 3 0 1002009HY982
2HZGPA:
U-001X;006OARN;STOCKHOLM ARLANDA;AMS;AMSTERDAM ;KL 1116 T T 28JUN1720 1925 28JUN;OK01;HK01;S ;0;73H;;;;5 ;;ET;0205 ; ;;712;;SE;NL;
LV7VC5.1:
02\1\0*LH3121\W\BLL03MAR1105A\FRA03MAR1240P\*\*\*\OKSO\143\*\395\*\1.35\*\*\1
DOODTW.0:
M3021 0HK26NOVAIRNLHRLONDON HEATHROW DXBDUBAI EK 2K 1345 0025 6.40 M 110 388003403 00TERMINAL 3 TERMINAL 3 0 002009DYVS3N
3PEBVO:
X-005;003OCPH;COPENHAGEN ;MXP;MILAN MALPENSA ;SK 1685 T U 28OCT0825 1035 28OCT;OK02;HK02;G
;0;321;;;20K;3 ;0725 ;ET;0210 ;N;1