Yep, you are right -- 62 isn't universal, tho it is the limit for the most of the carriers.

I found a chart for this.....
scroll down at: https://www.skyscanner.com/tips-and-...hecked-luggage

Surprisingly, one carrier goes to all the way to 118 inches, and Easy Jet has a generous 108 inch standard.

But with a few exceptions aside, the 62 inch/50 pound scheme is the most common limit by far, and one that most travelers should plan for, so I am still wondering why there are SO many bags out on the market, from leading vendors online and in stores, that do not conform!