Uber, DoorDash, Spirit, Altria and more
Check out the companies making headlines before the bell:Uber (UBER), DoorDash (DASH) – Uber fell 3.1% in the premarket while DoorDash tumbled 7.5%, following the news that Amazon (AMZN) struck a deal to add membership in rival food delivery service Grubhub as a free benefit for its "Prime" members. Amazon's deal also gives it the option to take a stake in Grubhub.Spirit Airlines (SAVE) – Spirit won the right to operate peak-hour afternoon and evening flights at Newark-Liberty International Airport. Spirit had been trying…