Base prices have generally been going down since the 90s https://www.bts.gov/content/annual-us-domestic-average-itinerary-fare-current-and-constant-dollars http

Base prices have generally been going down since the 90s https://www.bts.gov/content/annual-us-domestic-average-itinerary-fare-current-and-constant-dollars https://www.bts.gov/content/annual-us-domestic-average-itine.... It’s not enough data to attribute the impact of the broad switchover to baggage fees in 2008-2010, as base prices actually went up after introduction, but base prices are definitely down over time.