Maybe, but maybe not. They just signed a deal with Pratt and Whitney for engine maintainence for their fleet of DC-9s. If Pratt can do, well and I hope they do with this contract, they may be able to have them look at continuing the agreement with the purchase of Airbus A318s, or A32X series jets. Or they could use them as an airline to try to push Boeing for the PW6000 on the 717. I think we'll have to wait and see what happens. I think at the very least, they will use the DC-9's until their engine maintaince deal of 10 years runs out. If not, we may see other Pratt powered planes taking their place.
Not saying this deal will have any effect on their future fleet plans, but it MAY be something to consider. But it could mean nothing too.