oopps! guilty of this once in my life, drove from Indianapolis to Cinncinatti last year and checked in nice and early. Me and the guy with me then went for a beer, walk around the shops etc and I was surprised to hear us being paged, sauntered up to the Delta desk to get a good shouting at and told to run to the gate because we're holding the aircraft. Couldn't work out why the flight had been brought forward - we were halfway home before we worked out that cvg is an hour ahead of ind! - I always check the local time now.