The MD90s tie us over until the 320NEO becomes available and permit the parking of DC-9s and MD88s while keeping the fleet count constant.

I agree that a steady flow of new aircraft is essential to keeping the fleet efficient. In reality the MD90 buy does put us in company with Allegiant.

For now it seems prudent to withhold large capex and maintain status quo when it comes to aircraft.

C-Series: never at Delta, only at DCI if we sellout.
717: Ideal 110 seater 150+ in the world, sooner than you think.
A321: we'll see them 2013 with sharklets and CFMs to replace oldest 757 birds
A320neo: that will be our new narrowbody order with the PW GTF
777-300ER: right between 300 and 400 seats, will join the fleet
747-8i: remote chance if Boeing needs orders and part of reparations for the 787
787-900 will be a good bird for ULH 7ER and 764 replacement.
330 will be added as part of future non-organic growth
350XWB-1000 to replace the RR 777-200ER downrange.

YMMV

Cheers
George