Flying in Europe, it is about a 50/50 chance as to whether you get on the plane from a jet bridge or you take a bus to the plane parked on the tarmac. In contrast, most US airports have jet bridges, even when the plane is small unless it is a very small airport.
Why?
All I can add is a personal anecdote but most of the smaller regional airports I have ever flown through have boarded from the tarmac vs a jet bridge.
Yeah, but I’ve taken the bus to the airplane at major airports in the EU including Frankfurt. In contrast, the airports in the US that I’ve had to board on stairs are much smaller.
Oh yeah I’ve never taken a bus to the plane before