US airlines have pulled back sharply on service to Mexico, cutting nearly one million seats from summer schedules compared to last year. Who’s Cutting and WhereAmerican Airlines dropped nearly 170,000 seats from its Mexico routes this summer. The collapse of Spirit Airlines, combined with capacity reductions from other major US carriers, drove the total decline past the one-million-seat mark. Mexican Carriers Fill the GapWhile US airlines retreat, Mexican low-cost carriers are expanding aggressively. The Pratt & Whitney engine issue has affected some Mexican airlines, but it has not stopped expansion.