The Jets saw firsthand that Flacco, whom the Jets released before the season, still has plenty of good football left to play.
Trevor Siemian suffered an oblique injury in warm-ups but still started Sunday's game against the Jets.
Bears QB Justin Fields (left shoulder) in inactive Sunday so Trevor Siemian will start against the Jets.
Browns pass-rusher Myles Garrett, who had two roughing-the-passer calls on Jets QB Trevor Siemian among his four penalties Monday night, was fined more than $42,000 by the NFL.
Jets starting QB Trevor Siemian was replaced by Luke Falk after suffering a left ankle injury midway through the second quarter Monday night. Siemian, spotted in the locker room with crutches and a walking boot, will have an MRI on Tuesday.
Luke Falk will make his first career start Sunday vs. the Patriots after the Jets lost backup QB Trevor Siemian to a serious ankle injury. Regular starter Sam Darnold (mono) continues to improve but won't return until Week 5 at the earliest.