Sorry not to wait, hankir, but I may soon fall asleep after a (delightful) day with a 2 year old.
Lots of good clues, ending in a 5 way tie between GK #8, BBM2 #33 and #28, aristo #12 and rambler #10 all with 2 votes.
The runner-up is BBM2 with #28. After Googling, I do understand #33 but I really like the double meaning of "crib".
However, the winner is GK #8 with
"Smooth time in jet."
Your prize was suggested by my daughter-in-law Justine; the beginning can be difficult to hear but the sound clears in a short time.
https://www.youtube.com/watch?v=_XDxAzVEbN4
Thank you everyone who took part