'Houston, we have no problem', 3 letters
Affirmative from space, 3 letters
Afirmative from Gus Grissom, 3 letters
Alan Shepard affirmative, 3 letters
All right, to Armstrong, 3 letters
All systems go, in letters, 3 letters
Armstrong's Perfect!, 3 letters
Astronaut affirmative, 3 letters
Astronaut's 'thumbs-up', 3 letters
Astronaut's affirmative: Hyph., 3 letters
Astronaut's all perfect signal, 3 letters
Astronaut's Alright!, 3 letters
Astronaut's approval, 3 letters
Astronaut's assessment, 3 letters
Astronaut's assurance, 3 letters
Astronaut's Everything's fine, 3 letters
Astronaut's Perfect!, 3 letters
Cape Canaveral affirmative, 3 letters
Comment from a capsule, 3 letters
Excellent, for short, 3 letters
Fine, at Mission Control, 3 letters
Fine, to an astronaut, 3 letters
Fine! astronaut-style, 3 letters
Flawless, in NASA-ese, 3 letters
Good to go, at NASA, 3 letters
Great, astronaut-style, 3 letters
Great, to ground control, 3 letters
Hunky-dory for short, 3 letters
In perfect condition, 3 letters
Just fine and dandy, 3 letters
Letters of satisfaction, 3 letters
Like a perfect launch, 3 letters
NASA-style yes: Hyph., 3 letters
No problem, at NASA, 3 letters
Perfect, as a rocket launch, 3 letters
Perfect, informally, 3 letters
Perfect, NASA-style, 3 letters
Perfectly all right, 3 letters
Proceeding normally, 3 letters
Space capsule affirmative, 3 letters
Space-shuttle assent, 3 letters
Thumbs up for John Glenn, 3 letters
Thumbs-up in Houston, 3 letters
Thumbs-up, in astronaut-speak, 3 letters
Unlike the Mars Polar Lander, 3 letters
Unreservedly approvable, 3 letters
All right, informally, 5 letters
Astronaut's thumbs-up (var.), 5 letters
Houston, we don't have a problem, 5 letters
Perfect, at NASA (var.), 5 letters
Perfectly all right: Hyph., 5 letters
1983 Hawaiian Open winner, 4 letters
2004 World Golf Hall of Fame inductee Isao, 4 letters
5' 5 supermodel Devon, 4 letters
Benihana founder Rocky ___, 4 letters
Diminutive supermodel Devon, 4 letters
Great putter from Japan, 4 letters
Hall of Fame golfer and five-time winner of the Japan Senior Open, 4 letters
Hall of Fame golfer Isao, 4 letters
He came in second to Nicklaus at the 1980 U.S. Open, 4 letters
Isao ___ of the P.G.A., 4 letters
Isao of the Golf Hall of Fame, 4 letters
Japanese golf great, 4 letters
Japanese golfer Isao, 4 letters
Japanese golfing great Isao, 4 letters
Japanese swinger Isao, 4 letters
Model/actress Devon ___, 4 letters
Onetime Black Panther Richard, 4 letters
PGA Tour player Isao, 4 letters
Runner-up to Nicklaus at the 1980 US Open, 4 letters
Sr. PGA golfer Isao, 4 letters
Benihana founder Rocky et al, 5 letters
Affirmative responses, 4 letters
All systems go signals, 4 letters
Ardent affirmatives, 4 letters
Astronaut affirmatives, 4 letters
Astronaut's thumbs-ups, 4 letters
Astronauts' responses, 4 letters
Green lights in space, so to speak, 4 letters
Houston affirmatives, 4 letters
Space-age affirmatives, 4 letters