United Airlines Lost and Found Baggage " www.bookunitedairlines.com/united-airlines-lost-and-found-number/ " If you have left the aircraft, then one of the most prudent things that you can do is – just get back to the flight’s gate. After this, just find the staff or crew member of United Airlines even if it is a pilot or an air hostess. While telling this, do not forget to explain how your item looks like, what your seat number is, etc. If they are able, then they will surely recover the item immediately. In case they are not allowed to board the plane again, they will tell you about the procedural protocols of the United Airlines lost and found baggage.