This 2 MM (just short of three):
- Haven't been on a DL (NW) 747 (though I have with UA)
- Haven't done a E170 with DL
- Did a A330 while it was still NW
Have yet to add the A380 (yes I know DL doesn't fly them) and missed the chance for a trip on the Concorde. Looking forward to a chance at the 787!