I have a tkt lis-jfk-atl. Delta changed my flight jfk-atl because the lis-jfk flight time changed. Originally I had a 95 minute connect. With change, connection time changed to 65 minutes. I now have a 4 hour connection wait. Called diamond line and was told MCT is 120 minutes. I asked: "can you just put me back on the original 95 min connect flight? I have GE and carryon"? Was told there would be a fine from some fed agency if they did that. Not sure if true on all this as far as fines, but just telling you my experience as far as MCT time issue.