Originally Posted by
BonzoESC
It looks like it worked out; whining and moaning on FT doesn't cost DL very much, delaying an already-delayed flight costs a bit, but both of those are way cheaper than keeping redundant airplanes conveniently located for charters, or contract penalties for charter flights.
Sucks to get delayed like that, but check your contract of carriage. I think you'll find you get what you pay for.
Keeping a small number of aircraft in reserve for MX issues for the entire fleet would seem prudent to me especially with Delta's recent history of MX problems.