Yes, airlines generally keep their planes at airports overnight after landing. The specific location and duration can vary depending on various factors, including the airline’s operational requirements, flight schedules, and airport facilities. Here are a few common scenarios:

1. Hub airports: Airlines often have hub airports where they have a significant presence and operate a large number of flights. At these hubs, airlines typically have dedicated facilities, such as maintenance hangars, aprons, and parking areas, where they can park and store their aircraft overnight.
2. Outstation airports: Airlines also have regular destinations where they operate flights but may not have a significant operational base. At these outstation airports, airlines may use designated parking stands or remote parking areas to park their aircraft overnight.
3. Gate parking: Sometimes, if there is available space and the aircraft is scheduled for an early morning departure, airlines may choose to park the aircraft at the gate where it arrived. This allows for an efficient turnaround for the morning flight.

The duration of the overnight stay can vary. In some cases, it may be just a few hours if the aircraft is scheduled for an early morning departure. In other cases, the aircraft may remain parked overnight until the next day’s flight schedule.

Airlines consider various factors when determining where and for how long to park their aircraft, including operational efficiency, maintenance requirements, crew scheduling, and airport facilities. Each airline has its own procedures and arrangements in place to ensure the safe and efficient storage and readiness of their aircraft between flights.