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17d, ???h?s??, Abandon plane team leaders aboard.
20a, N????, Comfortable situation in hospital in French city.
21d, ??I?e??, Language stored in machines electronically.
29a, ?o????, Rule that's good concerning name.

20A: NICHE
H for hospital in NICE (Fr city)

17 sure about the "h"? Jet t is on
20 nic(h)e
21 Chinese, written within
29 g over n

17D: JET T IS ON

Jettison = abandon
Plane = jet
team leader=T
aboard =is on

Thank you all for help, sorry elle I put leftish instead of leftist, thanks again.

You're very welcome. G' Night!