Major U.S. carriers (United, Delta, American) offer schedule flexibility from Fresno Yosemite International Airport (FAT) through domestic hubs to European partners that can get you into EuroAirport Basel Mulhouse Freiburg (BSL) with one or two connections. United often connects via San Francisco (SFO) to Frankfurt or Zurich and partners with Lufthansa/SWISS for easy transfers to Basel; Delta routes through Seattle or Atlanta with SkyTeam partners to Amsterdam or Paris; American tends to route through LAX or DFW with Oneworld partners to London or Madrid and onward. European carriers (Lufthansa, KLM, Air France, Swiss) provide reliable transatlantic service from major gateways and smooth onward connections to BSL. Compare total travel time, baggage rules, seat selection fees and alliance benefits; for October travel, prioritize published connection protection to reduce rebooking risk.