Sky Clear

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Across
  1. 3. Doesn't go well with 5 across
  2. 5. 100LL, for one
  3. 7. Airport with runway elevation 9,934 ft.
  4. 10. Exactly 50nm from S50, conveniently
  5. 12. AGL or MSL
  6. 13. Location of the H-4 Hercules
  7. 16. Angle of ____
  8. 18. You can exchange 12 across for this
Down
  1. 1. Fun seaplane stop
  2. 2. County where you'd find the Spruce Goose
  3. 4. Like runway headings
  4. 6. Tech behind some steam gauges
  5. 8. 122.8, at Auburn
  6. 9. Some are convective
  7. 11. Cheesy airport to visit
  8. 14. Deadly for some with advanced degrees
  9. 15. Product of elevators and airfoils
  10. 17. 124.05, in Tacoma