reservation : a booking or arrangement made in advance
e-ticket: an electronic ticket that is stored in a computer system and can be printed out by the passenger
boarding gate: the location at an airport where passengers board their flight
delayed: when a flight or transportation is behind schedule and not leaving or arriving on time
above: higher in position or place
across from: located on the opposite side or facing something
leave a message: to leave a verbal or written message for someone who is not available
housing development: a group of houses or apartments that are built together as a single community or neighborhood