I found out recently that Delta has a perform-or-pay policy when it comes to delivering their checked bags on time. I earned 2,500 Skymiles by easily submitting a claim online after my checked bag didn’t arrive in baggage claim within the 20-minute guarantee.
“We’re committed to providing you with reliable and on-time baggage service every time you fly. That’s why we’re backing your bags with a guarantee: if your checked bag doesn’t arrive at the carousel in 20 minutes or less after any domestic flight, you are eligible to receive 2,500 bonus miles. Just complete the below form no later than three days after your flight’s arrival. Requests should only be submitted after your flight.”