- For passengers flying with Frontier, the Mexico City Office offers first-rate on-the-ground assistance. For both pleasure and corporate travelers, the office is a reliable resource for bookings, refunds, cancellations, and travel inquiries. It serves both residents and visitors who appreciate individualized treatment and is situated in the center of Mexico City. The Frontier Airlines Mexico City Office is essential to increasing customer satisfaction and loyalty in light of the growing demand for inexpensive flights to the United States. Speak with qualified Frontier representatives in person at the office to make sure every detail of your trip is handled.