Answer:

aok

Answer	Crossword Clue
AOK	Perfect
AOK	Space-shuttle assent
AOK	Fine

AOK	NASA assent
AOK	Fine, at NASA
AOK	John Glenn thumbs up
AOK	Just fine
AOK	Fine, at Mission Control
AOK	Just peachy
AOK	Perfect, as a rocket launch
AOK	Thumbs up

AOK	Hunky-dory
AOK	Astronaut's "fine"
AOK	Unlike the Mars Polar Lander
AOK	Fine, to NASA
AOK	"All systems go"
AOK	"Good here, Houston"
AOK	NASA's "fine"
AOK	Good to go

AOK	NASA's "no prob"
AOK	Just ducky
AOK	Thumbs up for John Glenn
AOK	"Perfect!"
AOK	Fine and dandy
AOK	NASA thumbs-up
AOK	Perfect, at NASA
AOK	No prob, at NASA

AOK	Copacetic
AOK	Peachy-keen
AOK	Super-duper
AOK	Comment from a capsule
AOK	Proceeding normally
AOK	Just dandy
AOK	Just fine, at NASA
AOK	Verbal thumbs-up

AOK	NASA's "Go"
AOK	Peachy
AOK	Spoken thumbs-up
AOK	Thumbs-up
AOK	Mission control go-ahead

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.