If you think you heard fighter jets zooming over Toronto on Monday you were correct.

A high-flying training military exercise between Canada and the U.S. was underway as we self-isolated at home.

The North American Aerospace Defense Command (NORAD) say they were involved in a training exercise with Royal Canadian Air Force CF-18 Hornet fighter jets over the “6.”

The exercise, which was developed in co-ordination with NAV Canada and is being conducted under Operation NOBLE EAGLE, emphasizes the surveillance and control of airspace over Canada and the U.S.

NORAD, in a release, said the fighters will be working with the Canadian Air Defence Sector at 22 Wing North Bay, Ont., and civilian air traffic control in the Toronto area to “practice response procedures in high-density airspace.”

They say the public below may see or hear the jets, which will be operating at a high altitude. The fighters might also conduct approaches at local airfields.

“This NORAD training event is not related in any way to the Government of Canada’s response to COVID-19,” NORAD officials wrote.

North American Aerospace Defense Command, which for more than 60 years has defended North America’s airspace, routinely conducts exercises with a variety of scenarios like airspace restriction violations, hijackings and responses to unknown aircraft.