I own several local properties but one out of province. Can I claim airfare to travel there to conduct maintenance and repairs and if so how many trips would be reasonable in a calendar year?
Yes, you are able to deduct airfare to go to your out-of-province rental property.
As for how many trips would be reasonable, you would need to contact the Canada Revenue Agency (CRA) to verify specifics about how many trips they would consider reasonable.
As per the CRA:
If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are elsewhere you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency
For more information on rental expenses please see this Canada Revenue Agency article:
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