Major carriers on the BOS–MUC corridor include Lufthansa, United, Delta (via partners), and seasonal carriers offering one-stop connections. Lufthansa often provides direct services and a strong onboard experience with traditional transatlantic amenities; United and Delta offer competitive itineraries via their U.S. hubs and Star Alliance/skyTeam partners for onward European connections. Compare seat types (economy, premium economy, business), baggage policies, loyalty program benefits (Miles & More, MileagePlus), and total travel time when selecting carriers for September travel. Secondary keywords: "Lufthansa BOS MUC", "United Boston Munich connection", "best airline Boston to Munich". CTA: Check in-flight amenities and loyalty perks, then book the airline that balances price, comfort, and schedule for your September trip.