* The most heavily traded shares by volume were Toronto Dominion Bank TD.TO, Sabina Gold & Silver Corp SBB.TO and Air Canada AC.TO. U.S. consumer prices increased by the most in more than 8-1/2 years in March and underlying inflation picked up as more parts of the economy reopened, thanks to increased vaccinations and massive fiscal stimulus. * Air Canada, struggling with a collapse in traffic due to the COVID-19 pandemic, reached a deal on Monday on a long-awaited aid package with the federal government that would allow it to access up to C$5.9 billion ($4.69 billion) in funds.