Airlines are offering 'basic premium' fares. Beware the potential catch.

JetBlue is planning discounted "Base" fares for its coming first-class cabin, which is expected to launch later this year. Thomas Pallini/Business Insider This post originally appeared in the Business Insider Today newsletter. You can sign up for Business Insider's daily newsletter here. Do you have champagne taste but beer money? JetBlue has a solution. The US airline is pitching a lower-fare option for its upcoming first-class cabin, BlueFirst. Travelers just need to be willing to sacrifice…