Answer: jetstream

AnswerCrossword Clue
JETSTREAM

Tropospheric wind current

JETSTREAM

Balloonist's propulsion, at times

JETSTREAM

High, high winds

JETSTREAM
California-to-New York flight aid
JETSTREAM
High-up air current
JETSTREAMWind system
JETSTREAMTroposphere phenomenon
JETSTREAMBand of high-speed winds
JETSTREAMTropospheric current
JETSTREAMIt's a blast for some balloonists
JETSTREAMHigh-altitude phenomenon
JETSTREAMCalifornia-to-New York flight quickener
JETSTREAMIt's indicated by arrows on a map
JETSTREAMTailwind for eastbound flights