FlyerTalk Evangelist
Join Date: May 2012
Location: MCO
Programs: AA, B6, DL, EK, EY, QR, SQ, UA, Amex Plat, Marriott Tit, HHonors Gold
Posts: 12,809
Delta has done this for C+ and F upgrades for years now. It’s usually an offer that includes a money and/or mileage upgrade. Miles are usually charged at the equivalent pay with miles rate.