Originally Posted by
deubster
At IAH (Houston) you can't really walk between terminals, but you can ride the tram in the basement and stay airside.
That is false. The basement train at IAH is landside.
There is the TerminaLink train above ground between terminals B, C and D/E that's airside. And C/D/E are all interconnected so you can walk round and round.
Continental has a bus that goes airside to the northside of Terminal A, but they are for passengers connecting to/from Colgan Air's CO Connection or DL/NW flights there.