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
XLA XLB XLD XLE XLF XLG XLI XLJ XLK XLL XLM XLO XLR XLS XLT
1 XLS Excel Aire Service, Inc. Callsign: Excel Aire, ICAO callsign changed to Excelaire USA AVCODES
2 XLS ExcelAire, LLC Callsign: Excelaire, ICAO callsign changed to Excel Aire. Owned by Hawthorne Global Aviation Services, LLC. USA AVCODES