 "If Vigilant Eagle is installed in all of them, the expenditure would total less than $1 billion, compared with the $6–$12 billion it would take to install protection systems on 6,000 aircraft".Airline carriers have also stated concerns with airplane-mounted systems because of the weight and cost of these systems.The DHS has stated that the cost of each flight carrying the countermeasure would be approximately $350; however, during the airlines’ best year ever, they only earned about $600 per flight.