1 Pain is located behind one eye or in the eye region, without changing sides.  Pain lasts a short time, generally 30 to 90 minutes (but can last for three hours); the headache will disappear, only to recur later that day (most sufferers get one to three headaches and some up to eight per day during a cluster period).
YYC Calgary International Airport, originally named McCall Field (IATA: YYC, ICAO: CYYC), is the international airport that serves Calgary, Alberta, Canada and the surrounding region; it is situated approximately 17 km (11 mi) northeast of downtown Calgary.
Calgary is located at the transition zone between the Canadian Rockies foothills and the Canadian Prairies. The city lies within the foothills of the Parkland Natural Region and the Grasslands Natural Region. Downtown Calgary is about 1,045 m (3,428 ft) above sea level, and the airport is 1,076 m (3,531 ft).