A Chicago-bound United Airlines flight from Boston was delayed Tuesday morning for "airport conditions," the airline said.
An airline spokesman all bags from Flight 636 were rechecked and two passengers and their baggage ultimately were removed.
"United flight 636 between Boston and Chicago was delayed because the crew requested that customers and their bags be rescreened before departure," the airline said in a statement. "The aircraft was swept and cleared for takeoff, and the flight is en route now."
It's not clear why the passengers were removed or why the bags needed to be rescanned.
The 7:48 a.m. flight was delayed until 11:02 a.m.
A day earlier the Boston Marathon was interrupted by two bombings near the finish line, leaving three people dead and more than 140 people hurt.
Chicago-area runners who flew back to O'Hare International Airport from Boston called the scene "absolutely terrifying."