Mexico's Hot for Low-Cost Carriers

The battle over immigration isn't the only fight going on at the border between the U.S. and Mexico -- an air war could break out before the year comes to an end.

Frontier Airlines (FRNT Quote) is already there, and the other three leading low-cost carriers are eyeing flights to Mexico, the second-biggest international aviation destination from the U.S., trailing only Canada.

Some observers say the low-cost carriers' inevitable next move will be to enter international markets. Frontier, at least, is there. During peak holiday periods this summer, it could offer as many as 86 flights a week to Mexico, or about 10% of its schedule. ...