I suppose Jet Blue can be successful across the pond with a narrow body aircraft and will be appealing to bottom feeders but I wouldn't touch them with a ten foot pole across the pond nor will those folks who enjoy a premium experience when traveling. For starters, they will need lounges and the ability to recover from TATL irrops (not as easily done like those domestic flights). What will Jet Blue's plan be when a day or two worth of TATL flying gets cancelled due to weather or computer issues (ALA Southwest) and they need to get a huge # of passengers over the pond? With only one aircraft choice, and a narrow body to boot, it will be a complete disaster in the making. Being stuck in the states for a few days is one thing, being stuck in Europe for what could potentially be longer than a few days is another. My opnion, Jet Blue should just stick to what they know best, JFK/BOS to Florida
JetBlue's Mint cabin is great. And bottom feeders? Really?
Lounge access can be rented from third parties.
Recovering from snags in the machinery isn't a problem. My prediction is that all the JetBlue's A321neos will be LR versions from 2019 onwards, and that they'll use those on rotation between transcontinental and TATL. Same plane, same configuration. So if one goes tech in London or Paris, another one will be rotated from stateside operations. The cargo capacity that is sacrificed by the 3 ACT tanks is not needed in Mint configured aircraft. Their one aircraft choice is actually their advantage, not disadvantage.
Why is being stuck in Europe worse than being stuck in the US?
Lastly I'll add that I think Norwegian's decision to go for the A321LR on medium long haul is what gave JetBlue confidence to do the same. Now there are three airlines that plan on using this airplane on TATL ops. I do believe TAP Portugal, Norwegian Air Shuttle and JetBlue is confident that the aircraft will perform as good as Airbus claims.