Save your crap for DU yourself, corny.
Fly enough to see all the fun myself up to and including the wheelchair services, which are not the responsibility of the FA OR the flight crew, but rather ground services who should know such a pax is coming from the origination point.
Fact is, all the majors are going to contractors because it’s cheaper, and they don’t care about occasional issues because people don’t really make choices based on that - usually just price and schedule.
The contractors are generally far less experienced then the company people, and mistakes multiply. And will stay that way since the turnover will be high.
This is not due to an error in the system or the lack of caring by an airline. Somebody screwed up.
Airlines do an amazing job for the most part assuring people who are very immobile still have the chance to get around. Keep up the good work United Airlines! I watch you serve disabled people each and every week. My hat is off.