You are correct. If you are cleared in 1st class, you will take any open 1st class seat. Same goes for coach. If you are checking bags you will need to collect them in LGA and then re-check them over at the shuttle terminal. We take the shuttle quite often when we go back to BOS to visit..... NO ATL!!!
I just asked my husband again and apparently I didn;t ask it right--you are correct about cattle call seating. There is an employee bus to the shuttle terminal BTW--we just discovered it when we shared a taxi from JFK w/shuttle pilot.
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