Red-eyed flight

A red-eyed flight is a flight scheduled to depart at night and arrive in the early morning. It can be caused by fatigue or late night travel. Red-eye flights offer numerous advantages for passengers. For example, passengers do not have to navigate peak hour traffic reaching the airport at their origin or while entering the city at their destination. These flights are also good for passengers who want to travel to a city and return the same day. They can save the money that they would spend for a night's stay in a hotel by taking the flight at night for return. Furthermore, red-eye flights allow passengers to spend a full day at both their origin and destination, especially by giving them time to complete any important tasks at their origin before flying out at night. Because of this reason, red-eye flights are popular among business travelers who benefit more from flying at night than during the day.

Examples
One definition of a red-eye flight is one that is too short to allow a full night's sleep. An example would be those flights from Los Angeles to New York City -about six hours' flying time - that depart between 2200 and 0100 will arrive between 0500 and 0700.
 * Singapore Airlines has flights from Singapore to Tokyo-Haneda, that departs at 22:45, and arrives at 07:00 in the early morning.
 * Red-eyed flights typically connect west coast to the east coast of the United States. They typically depart, between 10pm and 1am, and arrive at the East Coast at around 5pm and 7pm. It also connect Hawaii or Alaska with West Coast cities.

Historical availability
In the 1930s and 1940s, red-eye flights were not possible, as most airports did not have the equipment necessary to work at night. There are still airports that do not function after certain hours, or have curfews for noise reasons, limiting the number of airports from which red-eye flights can depart.