Delta Air Lines' Boeing 767 era is winding down, and no single aircraft is capable of filling the gap. The 757, the 767-300ER, the 767-400ER and the now-retired 777-200LR each did a different job, so each gets a different answer from Delta. That matters most on transcontinental routes, where seat count and cabin layout determine how many passengers the airline can carry and how much premium space it can sell. Get the match wrong, and the airline either leaves money on the table or leaves passengers behind. That is the puzzle Delta faces as its older jets age out, and the answer isn't a single aircraft.
