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Across
  1. 5. Coat of arms symbols
  2. 6. Model T maker
  3. 9. Africa explorer
  4. 10. Temporary ruler
  5. 11. Bound labor system
  6. 14. South Pole winner
  7. 16. Missing pilot
  8. 17. Pacific explorer
  9. 19. First on the Moon
  10. 21. Upper class rulers
  11. 23. Solo Atlantic flyer
  12. 24. Medieval contest
  13. 25. First American to orbit
Down
  1. 1. Royal household
  2. 2. Seat of power
  3. 3. Telephone inventor
  4. 4. Brothers of flight
  5. 7. Second on the Moon
  6. 8. Oil tycoon
  7. 12. Radio pioneer
  8. 13. Antarctic explorer
  9. 15. Rural worker
  10. 18. Armored warrior
  11. 20. South Pole loser
  12. 22. Attack on city