Air Canada got a lot of publicity last summer after an A320 nearly landed on a taxiway full of airplanes, instead of the runway, at San Francisco International Airport, and this week the airline is back in the news for another event at the same field. On tower audio from about 9:30 Sunday night, a controller can be heard repeatedly telling an Air Canada A320 crew to go around, and getting only silence. A tower supervisor used a flashing red light gun to try to alert the crew to abort the landing. After about two minutes, the crew responded, saying they had radio trouble.
Source: avwebAir Canada Crew Fails To Respond To SFO Tower