QAL
Landing space
QNH
Altimeter
QRK
Intelligibility
QRM
Man-made interference
QRN
Static interference
QSO
Communicate or contact
QSY
Change to transmission on other frequency
QDP
Accept guard or change guard
QSL
Acknowledge
QTA
Disregard (meaning there is an error in transmission)
H24
24-hr operation
NIL
none
QRF
Returning
QJH1
RYs test
HJ
sunrise to sunset
ALERFA
Alert phase
ACK
Acknowledge
AIREP
Air-report
BKN
Broken
ALTN
Alternate (aerodrome)
ARR
Arrival (message type designator)
BFR
Before
CAVOK
Visibility, cloud and present weather better than prescribed values or condition
CFM
Confirm