Puzzle

 ACROSS

  1 Alitalia's main hub in Italia

  5 Secular

  9 Consume soup annoyingly

 14 Bauxite and hematite

 15 Idris of "Thor: Ragnarok"

 16 Thin cookie

 17 In the mail

 18 Crying face emoji feature

 19 Bond agent?

 20 "Tough luck, buddy!" (see letters 2-7)

 23 They're below pecs

 24 Put away the groceries?

 25 Canadian sentence enders

 28 "This is between us" (letters 7-12)

 34 Opposite of paleo-

 35 Yoko's youngest

 36 German politician Merkel

 37 Wiener schnitzel meat

 39 Bragg and Ticonderoga: Abbr.

 41 Kids' guessing game

 42 "That makes sense"

 45 Golfer Aoki

 48 Afternoon affair

 49 Judge Marilyn Milian's reality show (letters 9-14)

 52 Always, to a poet

 53 "No more details, pls"

 54 Like Aleve, briefly

 55 Veer, and a hint to the indicated letters in 20-, 28- and 49-Across

 61 Think the world of

 64 Colombian metropolis

 65 Rock that flows

 66 Mars explorer

 67 "Frozen" snow queen

 68 Ripens

 69 Plugs of tobacco

 70 Rod's partner

 71 Mystical character

DOWN

  1 Like an optimistic outlook

  2 Twist-apart treat

  3 Aid in choosing sides?

  4 Stellar

  5 "Hmm"

  6 A Baldwin brother

  7 Vowel-shaped beam

  8 A resume summarizes it

  9 Make more desirable, as a deal

 10 Sgt. Friday's force

 11 Craft sighted in the Beaufort Sea?

 12 "Oedipus ___"

 13 Get too personal

 21 Flows back

 22 "Fuzzy Wuzzy ___ bear ..."

 25 Mocedades hit of 1974

 26 Elf, to Santa

 27 Patronize on vacation

 28 Ask to a party, say

 29 Acquire incisors

 30 Do-nothing

 31 Clumsy sort

 32 "Wait ___ Dark" (Audrey Hepburn thriller)

 33 Sci-fi flick FX

 38 Back talk

 40 Minnesota-to-Alabama dir.

 43 Leashes

 44 "Brave New World" drug

 46 Unlikely to mingle

 47 Eight: Prefix

 50 Lobster claw

 51 Of the eye

 55 All hands on a ship

 56 "The Wizard of Oz" surname (or wind!)

 57 If all ___ fails

 58 Roasted Garlic Pasta Sauce maker

 59 "Frozen" reindeer

 60 Lack of stress

 61 Storyline shape

 62 Homer Simpson utterance

 63 Egg cells 

Solution