United has their own mechanics. So, it wouldn't surprise me if United has no warranty except for defects from the factory, and also with a good rate on replace

United has their own mechanics. So, it wouldn't surprise me if United has no warranty except for defects from the factory, and also with a good rate on replacement parts. Otherwise it would probably be like a car. What you can't fix through a mechanic is a defect, and what you wear down (e.g. tires) are consumables.