I've always wondered about this when walking down the jetway on to an airplane. Are there companies that solely manufacture jetways, or are they constructed custom onsite from raw materials?
I would presume that a few companies manufacture them and then ship them to whatever airport needs them, but I've never noticed any name or manufacturer anywhere on the jetway. If they are made by a company, how are they shipped to the airport? Do they arrive in large pieces on a tractor-trailer truck, or is it many small pieces that have to be put together on site?
I've never seen a jetway on a truck, so I'd presume the latter. However, I could be wrong. So what's the case?