Answer: aoks

AnswerCrossword Clue
AOKSAstronauts' messages.
AOKSAstronauts' responses
AOKSSpace-age affirmatives
AOKSApprovals
AOKSBreezy assents
AOKSThumbs-up responses
AOKSPositive signs of life in outer space?
AOKSInformal approvals
AOKS"All systems go" signals
AOKS"Thumbs-up" responses
AOKSNASA green lights
AOKSAstronauts' "All's-well" calls
AOKSAstronaut's responses.
AOKSGood reports from astronauts.
AOKSNASA responses
AOKSAstronauts' answers.
AOKSAstronaut affirmatives
AOKSNASA affirmatives
AOKSLaunchpad thumbs-ups
AOKSNASA thumbs-ups
AOKSHigh "Si!"s?
AOKSAstronauts' affirmatives
AOKSArdent affirmatives
AOKSNASA nods
AOKSGreen lights in space, so to speak
AOKSAstronaut's thumbs-ups
AOKSNASA go-aheads
AOKSNASA approvals