A first-of-its-kind test program kicked off at Newark Liberty International Airport Monday night, as passengers on a United Airlines flight to London were offered free COVID-19 testing before boarding.

The flight departed Newark just after 7 p.m.

Any passenger who tests positive doesn't fly, and any passenger who won't take the test gets a different flight.

The transatlantic COVID-19 testing is a pilot program, and is part of a four-week trial.