The Globe and Mail reports in its Thursday edition that swooping in on airline stocks when they are down has been working wonders for investors who can stomach this volatile sector. The Globe's David Berman believes a buying dip is approaching. WestJet Airlines and Air Canada have been struggling with lower airfares, which has been weighing on their share prices over the past three months. WestJet shares have fallen more than 12 per cent since October and Air Canada shares have fallen nearly 20 per cent over the same period. If you had bought WestJet shares in the depths of the oil-induced Canadian economic downturn in early 2016, for example, you would have scored a 66-per-cent gain in about six months as the economy recovered. Mr. Berman notes airline stocks are not for everyone. Given their severe ups and downs, the stocks have not served long-term investors well. Many observers, however, believe that recent North American consolidation and cost discipline have given the sector a better profile. WestJet, in particular, is a name worth focusing on today, given its low valuation, its record of profitability and the fact that its share price has lagged rival Air Canada over the past two years.