Thanks for chiming in nk15 . You think about these things much the way I do, and our high risk household does leave us more COVID conscious than average.

Based upon the size of the cost differentials, I've booked my family in Delta F on the way to Aruba, with JetBlue Even More Space (taking advantage of B6's ability to book an Extra Seat/comfort seat to reserve an entire row) for their return. Three seats on JetBlue was cheaper than a single F seat in that direction.

I'm sure my travel-avoidant husband will have a variety of complaints upon his return, but I'll endeavor to post back here if he one or the other airline is particularly note-worthy for this route.