I think I've finished but there are two I can't parse. Both appear to refer to other clues (though maybe they don't!)
6D Rescues by plane runs across 17 yards? (8)
(17 is either WHELP or WON TON)
A _ R _ I _ T _
It looks as if it's AIRLIFTS but why?
29A For Magritte, this recalled 18 without emotion. (3-4)
(18 is HISTORIC)
I _ E - _ O _ D
I'm guessing ICE- COLD, but why?
Any suggestions welcome!