A-word part two

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Across
  1. 3. give permission for someone to do something
  2. 4. a business for carrying passengers and/or goods by aircraft
  3. 5. a set of letters
  4. 7. without other people
  5. 8. a machine that keeps the air in a building cool
  6. 10. a warning of danger, usually a loud noise
  7. 12. in total
Down
  1. 1. a special vehicle used to take sick or injured people to hospital
  2. 2. having lasted for a very long time
  3. 4. a collection of something that cannot be counted
  4. 6. in the middle of
  5. 7. living, not dead
  6. 8. a book used for collecting photographs
  7. 9. similar to each other
  8. 11. in a voice loud enough to be heard