Booked on DTW-PHX this summer on an A321. This weekend the flight number was changed. The seat map still looks like an A321 and the "my trips" section it is still an A321, but the aircraft type listed in the upper right corner is now "322". Does anyone know what "322" means? They will not have neos this summer yet, correct? Another flight I have booked on an A321 has the plane type listed as "WF2" on the seat map... What is the difference between 322 and WF2 (the seat map looks pretty much identical), and why does Delta come up with these unusual abbreviations?