koko: Eastern Shuttle -> Trump Shuttle -> U.S. Air Shuttle: all same company. Well, actually, Donald Trump bought the shuttle-related assets from Eastern in their "fire sale" before the bankruptcy, including planes, crews, and the new terminal Eastern had just built at the Eastern end of LGA. Later, Trump sold his shuttle company to U.S. Air, and they soon built their new terminal as an add-on to the Shuttle terminal. That's why the layout is so strange inside, floors are not at the same levels in the two airside wings, etc. The West side of the building is an add-on to the much smaller East side.