Two children are climbing stairs which lead to an airplane.
Children are boarding a Southwest Airlines plane.
It is not implied that the children are climbing the stairs to board the airplane, and the airplane is not known to be a Southwest Airlines plane.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_climb(e2) & to(e1,x4) & n_airplane(x4) & Actor(e1,x3) & v_lead(e1) & (x2 = x3) & n_stair(x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_board(e1) & n_plane(x2) & (x2 = x4) & ne_org_airlines(x4) & (x2 = x3) & ne_org_southwest(x3) & n_child(x1))