Air Canada is increasing service between Toronto and Rome to 10x weekly from 7x weekly for the summer season. Demand is obviously up and this route must now be proving popular as in the past this route was started, stopped, started etc. by Air Canada. The extra three flights will run from Jul 16 to Sep 12, 2009.
Overall Air Canada offers 17 flights per week to Rome from Montreal and Toronto
Source: Airline Route Updates