From Washington: Changes to air travel have occurred over the past 25 years. A class system for security screening has developed, with programs offering expedited checks for a fee. Passengers can no longer accompany traveling companions to the gate, a privilege that was once allowed.

Security checks have increased since a major shift in the industry. Further details about these changes are available from consumer advocacy groups.

The way people experience air travel has become more complex, with multiple lines and segmentation based on payment.