I am a Diamond Platinum member of Delta and I flew over 200,000 miles last year. It seems to me that I have seen a rather dramatic decline in Delta's service over the last six months. Of my last 12 trips with them, 50% have had delays of 30 minutes or more (up to 4 hours) due to mechanical issues. The planes are having a lot of 'beat up problems' such as broken seats, shabby interiors, etc. At the same time, they seem to be reducing the number of business class seats, and going to more flights without business class using small commuter carrier partners. Even though I am their highest class of member, I only receive upgrades about 50% of the time (at best). What are other frequent fliers seeing? Are their any other carriers whose level of service and equipment is better? I'm not worried about points, I fly all of the time so I will qualify for the highest level on whatever airline I go to.