You are at the airport, just back from your overseas trip. Your friends, who’ve come to receive you at the airport, are surprised to see you walking out of the airport with absolutely no luggage. They ask you about it. You say:
The airlines have misplaced my luggage. I am going to sue them.
The airlines have misplaced all my luggages. I am going to sue them.
The airlines have displaced my luggage. I am going to sue them.
The airlines are misplacing my luggage. I am going to sue them.