Before the start of the last earnings season, I put forward three stocks for investors to buy namely JetBlue ( JBLU ), Volaris (VLRS) and Virgin America ( VA ). While JetBlue has underperformed in the reference time period, both Volaris and Virgin America have proven to be winners. For the upcoming earnings season, I have shortlisted my three best picks from the aviation industry. Let’s take a look at the stocks. JetBlue and Volaris   Despite recommending them for the last earnings season, I think both JetBlue and Volaris deserve a mention. Shares of JetBlue have pulled back following the carrier’s failed bid to acquire Virgin America. However, I think investors should use the recent pullback to load onto the stock as it is undervalued. With JetBlue yet to completely roll out its Mint program and with air fares moving higher, I think the stock is cheap and has about 15% upside potential. As for Volaris, although I recently recommended investors to take ...