subsonic flight

15 LETTERS · STARTS WITH S

subsonic flight is a valid 15-letter word worth 25 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1U1B3S1O1N1I1C3F4L1I1G2H4T1

1 + 1 + 3 + 1 + 1 + 1 + 1 + 3 + 0 + 4 + 1 + 1 + 2 + 4 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does subsonic flight mean?