There doesn't seem to be any mention of this diversion, so I thought I'd give some info even though this occurred a few days ago.
My family and I were returning from Vancouver to Edmonton on Dec 17 on AC242, operated by A319 C-GAQZ. On final descent into YEG, runway 20, we appeared high approaching the threshold. A missed approach / go around was executed, and the captain came on the PA and said ATC had them coming in high and fast as the aircraft following had been dumping fuel and was coming in for an emergency landing. This happended about 22:30. Circling back around, we could see an aircraft landing on 20. After completing our landing, a BA 747 was taxiing towards the terminal. The BA pulled up to gate 58, we pulled up to gate 54. There was an EMS vehicle waiting on the apron at the gate. When we entered the terminal building, we walked down to gate 58 to look at the BA 747. Security personnel had the jetway doors open, and shortly the EMS team brought out a passenger on a gurney. Security, EMS and the RCMP were very efficient, and transported the passenger quickly though the terminal to the nearest landside exit.
It was exciting to see a BA aircraft in YEG, although it was in unfortunate circumstances. I was impressed by the efficiency of the emergency response at the airport.
This tripped was named the Emergency Landing Trip by my kids, as upon arrival in YVR on Dec 15 on AC235, we had to hold short of the gate as Air Canada flights were disrupted by an AC A320 out on a taxiway that had recently made an emergency landing due to hydraulic problems.
The day before in YVR, a Cathay A340 had done an emergency landing due to a flap indication problem, which made the news as the bridges local to the airport were closed to vehicle traffic until the landing was completed (successfully).
Our flight AC242 was initially to be operated by A319 C-GBIA, we were boarded when the captain informed us two fan blades were noted to be bent beyond tolerance limits. Had we not been delayed by switching aircraft, we would not have seen the BA diversion.