A passenger told ABC World News Tonight he and others restrained a pilot during an apparent seizure after an Air Canada flight diverted to Boston.

An Air Canada flight out of Newark, New Jersey, was forced to divert and land at Boston after the captain became "incapacitated" and a co-pilot had to take over.

MONTREAL - Air Canada says a pilot on a flight from Newark, N.J., to Halifax experienced a "medical issue" and the flight had to be diverted to Boston.