Why it's similar
United Airlines is a full-service carrier app with booking, check-in, boarding passes, miles, and connection maps, closely matching Fly Delta's complete trip-management scope. Both let you handle a flight end to end from your phone, with United carrying nearly 8 million ratings.
How it differs
United flies its own hub network and runs MileagePlus rather than Delta's SkyMiles, suiting different routes and travelers. At 4.78 stars it rates just below Delta. It is a direct full-service rival rather than a companion to Fly Delta.
