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When providing aircraft type on a flight plan, pilots/operators are required to include information about the on-board, certified equipment using an identifier code as a suffix to the equipment type.

Please visit wikipedia.com to see a more comprehensive list.

Navigation Capability Transponder Capability Suffix
RVSM AnyFailed transponder or Failed Mode C capability/H
No GNSS, No RNAVTransponder with Mode C/W
RNAV, No GNSSTransponder with Mode C/Z
GNSSTransponder with Mode C/L
No RVSM No DMENo transponder/X
Transponder with no Mode C/T
Tranponder with Mode C/U
DMENo transponder/D
Transponder with no Mode C/B
Transponder with Mode C/A
TACANNo transponder/M
Transponder with no Mode C/N
Transponder with Mode C/P
RNAV, No GNSSNo transponder/Y
Transponder with no Mode C/C
Transponder with Mode C/I
GNSSNo transponder/V
Transponder with no Mode C/S
Transponder with Mode C/G

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