The latest move comes from United Airlines, which filed plans over the weekend to discontinue serving Flagstaff, Arizona (FLG), and Texarkana, Arkansas (TXK) this fall, as first seen in Cirium schedules and later confirmed by the carrier.

United will cease flying between Houston (IAH) and Texarkana on Sept. 6, followed a few weeks later when flights between Denver (DEN) and Flagstaff (FLG) end on Oct. 30. When the carrier cuts these routes, it’ll mark the end of United service to both cities.

Additionally, United will stop flying between Los Angeles (LAX) and San Diego (SAN) as of Oct. 30. Unlike Flagstaff and Texarkana, San Diego will continue to be served from several United hubs, including Denver, Newark (EWR), Washington/Dulles (IAD), Houston, Chicago (ORD) and San Francisco (SFO).As for San Diego, United has flown the route from L.A. consistently for at least the past 40 years. The airline used the short, 109-mile flight to feed connections to and from San Diego through its hub at Los Angeles International Airport to cities across the country, as well as to international long-haul service.

United travelers based in San Diego will now need to either connect in San Francisco or Houston for transpacific flights or fly to hubs further east to get to cities in Europe. Alternatively, they could drive to Los Angeles, which takes about two hours, but is subject to highway traffic.