To make way for renovations at Baltimore/Washington International Thurgood Marshall Airport, Air Canada operations will permanently shift terminals starting Tuesday morning.

Running four round-trip flights a day from Baltimore to Toronto, Air Canada will move from the International Terminal to Concourse D, with flights running out of Gate D7. Ticket transactions will be done on the upper level of that terminal.

Airport spokesman Jonathan Dean said the change is part of a plan to improve Concourse D and E, a project now in the design phase that is expected to take several years and cost about $125 million to complete.

The work includes a new security checkpoint, a new connector between concourses D and E and a new arrangement of airline gates to accommodate more international flights, a release from the airport said.

Air Canada is one of the smaller of 12 airlines operating at BWI, serving 59,000 passengers last year. Southwest, the airport's largest carrier served nearly 16 million in 2013, Dean said.

arthur.hirsch@baltsun.com