As for my country, Mexico, I can tell you that Mexicana is already looking to retire or sell their last 22 B727´s. Actually, they already sold some planes to Allegro, another mexican airline. That is why Mexicana already operates the A320, so they can eventually replace their 727´s as well as their F100´s. The airline already operates 16 A320 and 8 more are expected to be delivered soon. However, I think they might use some of the 727´s on their regional airlines: AeroCaribe and AeroCozumel.
En Mexicana cumplimos 85 años de hacerte sentir el placer de volar sin limites