As per airlineroute.net Air Canada is cancelling it's twice daily Toronto-Providence service as of March, 2013
Also, on Atlantic Canada related news, looks like Charlottetown will be seeing a service reduction from it's normal summer schedule.
Quote:
Montreal – Charlottetown 15JUN13 – 03SEP13 Peak summer season reduced from 3 daily in S12 to 2 daily
Toronto – Charlottetown Service reduces from 3 daily in S12 to 2 daily
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http://airlineroute.net/2013/01/24/ac-domestic-s13/