* Law enforcement: The Phoenix Police Department and the Maricopa County Sheriff's Office both use helicopters for a variety of purposes, including patrolling, search and rescue, and traffic control. These helicopters are often seen flying at night, especially in areas with high crime rates or where special events are taking place.
* News media: Several television stations in Phoenix have their own helicopters that they use to cover breaking news stories. These helicopters are often seen flying over the city at night, especially when there is major news event happening.
* Medical transport: There are several hospitals in Phoenix that have their own helicopters that they use to transport patients to and from their facilities. These helicopters are often seen flying at night, especially in cases of emergency.
* Private aircraft: There are also a number of private pilots who fly their aircraft over Phoenix at night. These pilots are often hobbyists who enjoy flying for pleasure.
So, if you see a lot of helicopters and small aircraft flying over Phoenix at night, there's a good chance that they are being used for one of these purposes.
