Air Force One

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Across
  1. 3. To strengthen or reinforce something for protection.
  2. 5. Applying science and mathematics to design and construct machines.
  3. 8. A heavily fortified and secure stronghold or structure.
  4. 9. A system that uses radio waves to detect other objects.
  5. 10. Devices that produce heat, or a bright light used for signaling.
  6. 11. Usual or common.
  7. 12. Firm and not likely to give way.
Down
  1. 1. Changes or alterations made to something to improve or adapt it.
  2. 2. Relating to something that occurs in the air.
  3. 4. The ability to withstand for a long time.
  4. 6. Relating to buying and selling for profit.
  5. 7. Strips of material dispersed into the air to distract enemy radar systems.