I've been flying ultra-low-cost airlines for years and have never been charged extra — these are my 4 tips for avoiding fees

Tech Insider : Travel, Travel
Spirit Airlines bag check
Spirit and Frontier have size checks stationed at the check-in desk and boarding gates.

Eric Glenn/Shutterstock

You can soon pay to avoid sharing armrests on this airline

Tech Insider
airplane seat
Frontier Airlines is offering a new seating upgrade.

Seung Heo/ iStock

Subscribe to budget-airlines