Answer: airalert

AnswerCrossword Clue
AIRALERT

Pre-sortie signal

AIRALERT

Wartime warning

AIRALERT

Wartime signal

AIRALERT
Fighter squadron's signal
AIRALERT
Signal to combat pilots
AIRALERTSignal that starts a scramble
AIRALERTEnvironmental warning
AIRALERTSortie signal
AIRALERTNoise heard during the London Blitz
AIRALERTWarning during the Battle of Britain