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Crossword solution:

13 clues for "AOK":

  1. All systems go!
  2. Thumbs-up
  3. Astronaut's "all right!"
  4. Astronaut's 'fine'
  5. Astronaut's "perfect"
  6. NASA thumbs-up
  7. Perfect! NASA-style
  8. Astronaut's "thumbs up"
  9. "Everything's fine!"
  10. Fine, Houston
  11. Hunky-dory, for short
  12. 'Perfect'
  13. Thumbs up response