Legal access to restricted airspace can be managed through the use of the FAA's Low Altitude Authorization and Notification Capability (LAANC) system.
To learn more about LAANC, AirMap has a great resource: AirMap LAANC Support
After signing up with AirMap, Map Pilot users can manage their airspace authorization by using a method called "Deep Linking". This allows Map Pilot uses to pass their anticipated flight path to AirMap who then passes the information along to the FAA to get authorization.
The list of airports that support LAANC is growing and a current list of participating airports can be found here:
The following image shows a standard Map Pilot flight plan, but note the GREEN circle to the right of top status bar. That denotes that there is a response from the local flight authority. The dot is called the LAANC Availability Indicator.
The LAANC Availability Indicator can be tapped to show the response from the AirMap LAANC system regarding the availability of automated or manual authorization capabilities.
Here is a brief video walkthrough of the entire process from end to end: