Real world company prefixes

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X1 X3 X4 X5 X6 X7 X8 X9 XA XB XC XD XE XF XG XH XI XJ XK XL XM XN XO XP XR XS XT XU XV XW XX XY XZ
1 X8 Federico II Airways, S.p.A. ICAO: FDE, Callsign: Federeagle, IATA designator changed to 2D I AVCODES
2 X8 Icaro S.A. ICAO: ICD, Callsign: Icaro, IATA Prefix: 545, Founded in 1971. Ceased operations during 2011. EC AVCODES
3 X8 Airmax S.A. ICAO: MMX, Callsign: Perumax, IATA Prefix: 658, PE AVCODES