Canada on Tuesday announced a Can$55.6 million ($55.7 million) contract to modernize two military radar systems said to play a major role in defending North American airspace.

The deal, announced by Defense Minister Peter MacKay, is part of a major effort by Canada to upgrade its air force, a drive that includes the acquisition of new F35 fighter jets.

The radars will replace aging systems in Alberta and Quebec, providing "long-range air surveillance and aerospace control capability" in support of military operations in Canada and abroad, a statement said.

They are to be delivered starting in February 2013.

MacKay also announced the purchase of 14 aircraft cargo loaders for Can$5.6 million ($5.6 million), from TLD America.