Assertion: attendant's seat | /r/HasProperty | locked upright
Facets:
Source sentences:
text: They then check that all passengers follow all federal and company regulations by making sure that everyone has fastened their seatbelts and all seats are locked upright.
text: Before the plane reaches its final destination, they repeat the same procedures before the plane took off by checking that all passengers have their seatbelts on, seats are locked upright and carry-on baggage are correctly stowed.