The carrier is raising annual fees for cards and lounge memberships, but says that perks are improving and that consumers are still spending.

Making even one credit card mistake can wipe out all of the cash back or rewards you've earned. Learn what you need to avoid.

United Airlines is raising annual fees for its popular rewards credit cards and yearly lounge passes. The carrier is also changing some of the benefits. Airlines have been adjusting their loyalty programs to reward their biggest spenders,