In Android, the AIR runtime is loaded as part of the application itself and has the same privilege as the application. The AIR runtime is started as a separate process only in a very few cases. For instance, when invoking the File Open/Save dialog. However, if there are multiple AIR applications running, Android may manage a shared copy of the AIR runtime for all those applications.
Android automatically shuts down selected applications when memory is low and when memory is required by other applications that are ’visible’ to the user. Hence, your inactive AIR applications may get closed by the OS.
Use your device’s memory management settings to clear inactive processes before running multiple AIR applications.