Spirit is operating 29 MD
-80. 7 of them are leased.
The deal with Airbus consists in an order, in March 2004, for 35 aircraft + 60 options.
4 A321 were delivered last year. 21 are to be delivered within the next five years.
2 A319 have been delivered last March. 8 more should be delivered by the end of 2005.
-80's are retired progressively on a one-on-one basis, as the first Airbus arrived.
Sources = Airliner World Mag. April 2005.