sitting on one of these SFO-ORD. They swapped configurations at the last minute which caused a boarding nightmare. Initial cause of delay was maintenance, which was wrong. The boarding took so long that many people missed connections and with Newark being shutdown people have been exiting the plane. they have shut the doors 3 times, now 1:20 minutes late and still here and weather is now the reason for delay. what a joke, i hate this plane