Moderna's sign is seen outside of their headquarters in Cambridge, MA on March 11, 2021.Boston Globe | Getty ImagesCheck out the companies making headlines in midday trading Friday:United Airlines, American Airlines - Airline stocks were hit hard during Friday's sell-off, as the new...

A Southwest Airlines Boeing 737-700 (LN2318) on final-approach after a pre-delivery test flight at dusk.aviation-images.com | Universal Images Group via Getty ImagesDemand for air travel is on the rise ahead of the holidays. So are the costs.Jet fuel hasn't been this expensive since...