How to avoid a $600 price hike for American Airlines

United Airlines will soon offer free flights for new customers beginning Nov. 2.

The airline, which had previously introduced a $5-per-ticket fee for new users, has also introduced a free upgrade offer for existing customers.

The discount comes on top of a $1.70 fee for existing American customers who upgrade to an Airbus A380.

The American Airlines Arena upgrade will cost customers $300, an airline spokesperson said.

United has a long history of offering free upgrades for existing passengers, but in recent years, some airlines have cut the number of flights available.