several people at an airport.
The people are waiting for their flight.
Just because people are at the airport does not mean they are waiting for a flight.
exists s1 x1 x2.(a_topic(x1) & at(x1,x2) & n_airport(x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_flight(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & for(e1,x2) & Actor(e1,x1) & v_wait(e1))