1. Dirty air
5. Iniquities
10. Extinct flightless bird
14. Relating to aircraft
15. Audio communications
16. Always
17. Bland
19. Blue-green
20. Snake-like fish
21. Midsection
22. Robust
23. Repeal
25. Kick out
27. Terminate
28. Grinding
31. Not right
34. Successors
35. Caviar
36. A musical pause
37. Shrewd
38. Cried
39. Altitude (abbrev.)
40. Gesture of indifference
41. Indicates
42. Egyptian tourist attraction
44. Not near
45. Borders on
46. A fractional monetary unit
50. Old gold coin
52. It pumps blood
54. Tall hill
55. Module
56. Nebulizers
58. Headquarters
59. Column of wood
60. Achy
61. Totals
62. Something of value
63. At one time (archaic)
2. Donnybrook
3. Not written exams
4. Governor (abbrev.)
5. A task requiring a trip
6. Unexpired
7. Midmonth date
8. Heeding
9. Mayday
10. Separate
11. Overly fatigued
12. Deceased
13. Paris airport
22. Snake sound
24. 1/100th of a dollar
26. Deviate
28. Taxonomic group
29. No
30. Obtains
31. Envelop
32. Depend
33. Exclusion
34. Adversities
37. Voucher
38. Herbaceous plant
41. African language
43. Wanes
44. Polecat
46. A steel wire rope
47. Scorn
48. Swerves
49. Beginning
50. Anagram of "Buds"
51. Two-toed sloth
53. Goddess of discord
56. An Old Testament king
57. South southeast