Officials say that during the flight from Newark Liberty International Airport to Halifax, the captain experienced a medical episode and was removed from the flight deck.
Arrests were made outside an ICE facility at Delaney Hall after some protesters violated the curfew.
Late Saturday night, Newark Mayor Ras Baraka ordered a mandatory curfew from 9 p.m. to 6 a.m. for a half mile surrounding Delaney Hall, effective immediately.
After eight days of demonstrations that have turned violent at times, New Jersey Gov. Mikie Sherrill is putting state police in charge of monitoring protesters instead of ICE.
Demonstrators returned to Delaney Hall on Thursday, where several protesters were pepper sprayed and have since brought out black umbrellas to fight off any chemicals being sprayed in their direction.
Protesters are facing off against ICE agents outside Delaney Hall migrant detention center, where a hunger strike is underway.