it is a flight strip, and it's how they track flights. they do print messages on them, but the main purpose is to track which planes are in a given sector and a

it is a flight strip, and it's how they track flights. they do print messages on them, but the main purpose is to track which planes are in a given sector and at what altitude or to sequence takeoffs and landings. https://www.faa.gov/air_traffic/publications/atpubs/atc_html/chap2_section_3.html https://www.faa.gov/air_traffic/publications/atpubs/atc_html... https://en.wikipedia.org/wiki/Flight_progress_strip https://en.wikipedia.org/wiki/Flight_progress_strip