"Masked" is the term for aircraft which are enrolled in one of two FAA programs designed to exclude the position or transponder identifier information from the public domain. These are the Limiting Aircraft Data Displayed (LADD) program and Privacy ICAO aircraft address (PIA) program. SkyGlass is able to display these aircraft because all aircraft transponder broadcast their ADS-B data "in the clear" on unencrypted frequencies which are received by the community of crowdsourced feeders which supply ADSB Exchange. Other data suppliers are obligated by the FAA to filter their data given to the public of aircraft in the LADD and PIA programs.