While Alaska, American, Delta, Frontier, JetBlue, Southwest, Spirit, and United have received tentative approval from the U.S. Department of Transportation to fly to Havana, their flight schedules have not yet been confirmed. As such, the airlines cannot begin selling airfare to Havana until government approval is finalized. (Travel and Leisure)
JG: Not all airlines are created equal. During my vacation in Spain in April 2015, one of the airlines listed above lost my suitcase temporarily. I could not change clothes for 72 hours. Be prepared for inconveniences and snafus. That is part of traveling in today's modern world.