I’ve never crossed the pond as a pilot. But in the spirit of jetblue, I’ll take a stab at building a pairing without asking someone who has or reading our cba anyway! Using today’s block times for daddy D on the 76 and overlaying our current rigs.
Date Cities Report Out/In Block Duty
3/18 BOS-LHR 19:12 20:12-07:00 5:48 7:03
Layover 25:20
3/20 LHR-BOS 08:35 09:20-13:10 8:50 9:50
Duty 16:53 TAFB 42:13 Block 14:38 Credit 15:00
Now there might be complications to this such as earlier report times, longer flight times for the slow 321, augmented crews, multiple flights allowing different or longer layovers, etc. I don’t know, but neither do the people who will be building the pairings.

I’m not loving the idea of a 75 hr line with 15 days on and 10 atlantic crossings.