People hanging out in an airport terminal.
People are waiting for their flight
Just because people are hanging out in an airport terminal that does not mean they are waiting for their flight.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & n_terminal(x3) & of(x3,x4) & n_airport(x4) & a_out(s1) & Manner(e1,s1) & Actor(e1,x2) & v_hang(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(for(e1,x2) & n_flight(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_wait(e1) & n_people(x1))