Authorities shut down one of the busiest airports in the US on Monday, March 23, after a fatal accident occurred on one of its runways. New York LaGuardia International Airport (LGA) is completely closed until at least Monday afternoon after an Air Canada regional plane collided with a fire truck that was crossing a runway on Sunday night. The CRJ-900 was flying from Montreal on Air Canada Express Flight 8646 and was operated by Jazz Aviation, a subsidiary of Air Canada. 72 passengers and four crew members were on board. Both the pilot and the copilot died in the incident, which occurred at about 11:45 p.m. on Sunday, according to a post on X from Secretary of Transportation Sean Duffy. There were 41 passengers and crew who were sent to nearby hospitals, according to a press conference by the Port Authority of New York and New Jersey, which oversees LGA. At least 36 passengers were treated and released from the hospital, but some fliers remain hospitalized with serious injuries, the Port Authority said.…