Major airlines and airports, as well as both domestic and international travellers, could face added costs if pre-clearance services are lost in Canada, says an aviation expert.

Pete Hoekstra, the U.S. ambassador to Canada, said on Thursday that pre-clearance locations in Canadian airports are seeing declining numbers, as travel to the U.S. out of Canada slumps this year. The ambassador floated the idea that the U.S. may need to reassess offering the service.

"We're not sure we can make the numbers work anymore … pre-clearance is something that is done at the expense of the U.S. government. We paid for it," Hoekstra said at the Global Business Forum in Banff, Alta.

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"You know, [if] you can't make the numbers work anymore — you'r

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