AOKAY

• All is well!

• All right, informally

• All systems go!

• Astronaut's thumbs-up (var.)

• Excellent

• Fine and dandy

• Fine, informally

• Good to go

• Houston assurance

• Houston, we don't have a problem

• Hunky-dory

• Jim-dandy

• Just ducky

• Just perfect

• NASA phrase

• Perfect

• Perfect, at NASA

• Perfect, at NASA (var.)

• Perfectly all right: Hyph.

• Thumbs up