Delta flyers slam SkyMiles program overhaul: 'The biggest middle finger yet'

• Delta is making big changes to its SkyMiles program — and many frequent flyers aren't happy. 
• Some flyers said on social media that they're switching airlines as a result. 
• The changes were based on customer feedback, a Delta spokesperson said.

Delta Air Lines recently unveiled a significant overhaul of its SkyMiles loyalty program, triggering a swift and vocal reaction from disappointed travelers on social media.