These covers are both postmarked 11th Dec 1934.
Winnipeg to Bissett is marked as "AM" posting and Bissett to Winnipeg is marked as "PM" posting.
Both covers have a corresponding 'arrival' cancellation on the back.

Presumably the flights were on the same aircraft.
This is reasonable, Winnipeg and Bissett are only about 160 km (100 miles) apart on a direct flight route.
So even with the flight speeds at that time a return trip in a single day would be feasible.

The covers are in good condition, refer to pictures for markings, etc.
There is staining around the stamp on the Winnipeg to Bissett cover.
The flaps have been stuck down.

Please look at my other Canada 'First Flight' covers.

 

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