Maybe, but they only did ATL out of the west coast and with zero connections. This time it would be out of a massive NYC and/or BOS hub (and maybe others eventually) with much more connections. When DL and AT went BSC (bat dung crazy) seat dumping, they pulled out because they needed the AC to open BOS, which DL had just basically given them an abandoned terminal. They successfully deployed those AC to BOS and dominated DL in the market while DL sits on an underutilized Taj Mullin terminal while JB is the most dominant carrier in BOS by far.

Like any carrier in endless growth mode though, they will try it again eventually. So will VX and others. The question now is will DL do another massive seat dump in the era of "capaticy dicipline" or will DL pull down even more capacity in an unsustainable attempt to preserve RASM like we've been doing?