Charlie... United is the largest airline in North America (or so their ads say... is Air
Canada larger BlondeBomber?) U-A has a lot of planes and a lot of hubs and a lot of cities served. They also virtually cover the world (Asia, South America, Europe, Australia, Hawaii, I don't think Africa or Mid East.. but Lufthansa takes care of that.)
It's a powerful airline and a lot of us fly U-A. It's also one of the biggest employee owned companies in the world. You can say U-A is the British Airways of the U-S-A (sorry Merry) but sometimes without the service or the attention.
I know I'm going to get a zillion posts for that last remark!

!!!
Megamiles also explained well why U-A may get a lot of postings. And Merry concurred (Although I don't think anything RUdi and I post is banal!) CATMAN