Canada may continue to bar Americans entry for much longer still, but Canadians have never been barred from flying into the States. Maybe Canadian SPs can travel to the States for "vacations".
CBC -- June 12, 2020
"Many Canadians are unaware that, even though they're currently barred from driving to the U.S. for leisure travel, they can still fly to the country.
U.S. Customs and Border Protection (CBP) told CBC News that its travel restrictions apply only to Canadians trying to enter the U.S. at land border crossings, which includes travel by car, train, ferry and pleasure boats.
However, Canadian air passengers can still enter the country as long as they
haven't visited Brazil, China, Iran, Ireland, the U.K. or 26 European countries in the
Schengen Area 14 days prior.
Canadian travellers also likely won't have to self-isolate for 14 days upon arrival. The U.S. Centers for Disease Control and Prevention
recommends that international travellers do so, but it's not a requirement unless specified by a particular region or state. For example,
Hawaii requires that air passengers self-isolate for 14 days.
When Canadians return home, they must self-isolate for 14 days —
as per federal rules."
. . .
"The permission to fly isn't reciprocal: Canada prohibits U.S. visitors from entering the country via all modes of transport — including by plane. However, this week, the Canadian government
loosened its travel restrictions to allow U.S. citizens with immediate family in Canada to enter the country."