19. Judgments made on the fly : SNAP DECISIONS
29. Call it quits : THROW IN THE TOWEL
39. Take a nap : CATCH FORTY WINKS
55. Football play comprised of the starts of 19-, 29- and 39-Across : COMPLETED PASS
See above.
Melissa here. This will be brief - having some issues with blogger.
Across
1. Pop singer Anthony : MARC
5. Drive-__ window : THRU
9. Annoying email : SPAM
13. "Then again," in texts : OTOH. On The Other Hand.
14. Real howler : RIOT
15. In and of itself : PER SE. Latin, meaning in itself.
16. Arnaz of early sitcoms : DESI
17. Save-the-date card follow-up : INVITATION
21. Joe of "NCIS" : SPANO
22. "Dang!" : RATS
23. "The Crying Game" actor Stephen : REA
24. Hole in one : ACE
25. Connecticut Ivy Leaguer : ELI
27. Taunting laugh : HAH
36. Champ's cry : I WON
37. Airport compliance org. : FAA. Federal Aviation Administration.
38. Cuban currency : PESO
44. Patriotic women's gp. : DAR. Daughters of the American Revolution.
45. Clever laugh : HEH
46. Ef counterpart, in temperatures : CEE. Ef as in Fahrenheit, CEE as in Celsius.
47. NW state with a panhandle : IDA. Idaho.
50. Simpson who's a member of 12-Down : LISA
53. Tryst participant : LOVER
58. First sequel's sequel : EPISODE III
59. Pandora's boxful : ILLS
62. Cut again, as lumber : RESAW
63. Apollo 11 destination : MOON
64. Earth goddess : GAIA
65. Part of GPS: Abbr. : SYST
66. Like some telegrams : SUNG
67. Tiny part of a min. : NSEC. A nanosecond is one billionth of a second.
Down
1. "The __ Squad" : MOD
2. Dined : ATE
3. 1995 Reform Party founder : ROSS PEROT
4. Great Wall locale : CHINA. Look.
5. Libyan port : TRIPOLI
6. Rear : HIND
7. 63-Across exploration vehicle : ROVER
8. Erie Canal city : UTICA
9. Alien-seeking gp. : SETI
10. Aforementioned : PRIOR
11. Together : AS ONE
12. Group with an annual Mind Games competition : MENSA
15. Volkswagen family car : PASSAT
18. Ten percent donation : TITHE
20. From the beginning : ANEW
21. The "u" sound in "census" : SCHWA
24. Suffix with problem : A TIC
26. Help desk offering, briefly : INFO
28. Arizona tribe : HOPI
30. How some pics are stored : ON CD
31. La Brea stuff : TAR. Museum.
32. Owns, biblically : HATH
33. Holiday carol's "Good King" : WENCESLAS
34. Glacial ridge : ESKER. Virtual field trip of Blakeney esker.
35. Get rid of : LOSE
40. Consecrate : HALLOW
41. Like much pub grub : FRIED
42. Kennel cacophony : YELPING
43. "Now, just hold on" : WHOA
47. "Happy birthday" writers, perhaps : ICERS
48. Dwarf who swept up Doc's discarded diamonds : DOPEY
49. Off the mark : AMISS
51. Plant parts : STEMS
52. Vowel fivesome : AEIOU
54. Champ's gesture : V SIGN. V for Victory.
56. Natl. Merit Scholarship qualifying exam : PSAT
57. Frontman for the Belmonts : DION. Dion and the Belmonts.
60. Perjure oneself : LIE. All too common in court.
61. __ fly: RBI producer: SAC. Sacrifice.