Route: LAX-BOS (flew LAX-JFK-BOS)
Fare: A (flew C/P)
Status: ASMVPG/DL FO (flew as AS, but also FO)

What Happened: Flight showed on-time until the exact minute of departure, then boom listed a 7 hour mechanical delay. Ended up being almost 8 hours delayed. I emailed CS and mentioned that the plane never left the hanger and if they had posted the delay earlier folks could have made it to BOS that evening instead of the next morning.

Compensation: Emailed customer service and asked for 20k miles or $200 voucher. Received 20k miles. I would say they sent a form letter response, but the email had at least one typo. Way to go DL.

Side note, on the LAX-JFK the captain spoke to everyone in D1 and mentioned their SM status.