text:  Canada's second largest airline, WestJet, says it's cancelled at least 150 flights affecting 20,000 passengers after its maintenance union announced that it's on strike. The union is saying its members walked because of the airline's unwillingness to negotiate with the union. The surprise strike affecting flights happening during the Canada Day long weekend. Calgary, Alberta, WestJet saying that it was extremely outraged. I'm Chris DeBell. This is Fox News.