Martha Bellisle.

As Immigration and Customs Enforcement deportation flights reach record highs, the airlines running the trips have taken steps to make it more difficult to track the planes used to carry shackled people across the country and around the world. That’s according to independent groups monitoring the flights. In recent months, ICE Air contractors started using dummy call signs for the planes in the air and are hiding their tail numbers so they can’t be located on public tracking websites. Once on the ground, the planes are parked behind buildings so the migrants can’t be seen arriving or boarding. Despite these obstacles, dedicated immigrant rights advocates have created ways to follow ICE flights using shared information and crowdsourced data from radio signals.