Mexicana de Aviación the world's fourth oldest airline operating under the same name, after the Netherlands's KLM, Colombia's Avianca and Australia's Qantas. In 2009, the Mexicana group of airlines (including Mexicana Click and Mexicana Link) carried just over 11 million passengers (6.6 million on domestic routes and 4.5 million on international routes), using a fleet of some 110 aircraft. Over the three years prior to folding, the Mexicana group had increased their share of what was a burgeoning domestic market, from around 22% at the beginning of 2007 to somewhere between 28% and 30% for most of their final 12 months. This was
Continuous function compact space and its codomain is Hausdorff, then it is a homeomorphism. Given a function where "X" is a topological space and "S" is a set (without a specified topology), the final topology on "S" is defined by letting the open sets of "S" be those subsets "A" of "S" for which "f"("A") is open in "X". If "S" has an existing topology, "f" is continuous with respect to this topology if and only if the existing topology is coarser than the final topology on "S". Thus the final topology can be characterized as the finest topology on "S" that