Why it's similar
American Airlines is a full-service legacy carrier app, the closest match to United, with booking, check-in, boarding passes, and gate-to-gate connection maps. Reviewers praise its up-to-date flight info and helpful connection directions, the same trip-management strengths United users rely on.
How it differs
American flies its own routes and runs the AAdvantage program rather than United's MileagePlus, so it suits different travelers and networks. Reviewers report the app dropping booking info when switching apps. At 4.76 stars across about 1 million ratings, it rates just below United. It is a direct legacy-carrier rival.
