After reading this post, this are my words:
Yes, Mexicana is all ready in process of retirement fleet. It was announced that the last B7272 from the company will be gone by 2003. They are operating all ready the 3 Airbus 3-1-9, and waiting for another 9, which is going to give them a total of 12 by the end of 2002.
My predictions of fleet retirement:
Aeromexico, forever Boeing...
B717 replacement for the DC9, just like Rojo said, AM is building a VERY large fleet of MDs82/83/87/88. Today they have a total of 44 aircraft. The replacement in a future could be the B737-800 just like Varig did, getting this equipment. Same for long haul routes... B777 it´s just perfect.. also their alliance parterns, (Delta, Air France and Korean) operate this acft. Also a good example is Varig again.
Mexicana, More Airbus than Boeing...
As Alvaro said, I heard that they were planning to lunch Mexicana Express, so all the Fokker 100 will go to what is now Aerocaribe. So the perfect replacement will be the A318/9 again. So they won´t change their mind... also pilots will have the licence to fly the 318/319/320/321 for other acfts like the 330/340 they just need to do some extra sim hours and their set!
Also I agree RayChuang as it mention before I think they could get more seats in those routes like SFO, ORD, MDW, LAX, from cities like BJX, ZAC, MLM, GDL, MEX, a good option will be adding more B757-200 and why not... -300 series.
Finally I can said that for lang haul routes the perfect acft could be the A340. A good example is LAN Chile.. they got A320 and A340 acft to their fleet... why not Mexicana.
Flights to FRA, are about to open... to bad they will be served on B757-200 acft. Route will be MEX-HAV-FRA.
Another possibility is adding the B767-2/3.
I think they will get MD series 87s and maybe some 80s for replacement of their DC9s. B717 is too good to be true.
They also would have to face the fleet retirement and get better aircraft before 2004.