DAYLIGHT SAVING TIME in the US is to be changed. Congress passed the Energy Policy Act of 2005, where tucked away is a provision to extend daylight savings time (DST) or ”summer time” in the US by one month, and for this change to take effect in 2007. Currently, US DST begins on the first Sunday of April (one week after the EU), and ends on the last Sunday of October (as in the EU), as established by the US Uniform Time Act of 1966. This creates only one week per year that EU/US DSL schedules are not synchronised. However, the energy bill will move up the start of US DST, to the second Sunday in March (two weeks before the EU), and extend it to the first Sunday in November (one week after the EU). This gives three weeks during which the EU/US DSL schedules will not be synchronised. While the changes will have minimum effect on travellers, it will cause problems for airlines. As far as ABTN sponsor OAG is concerned, Dunstable will just alter the date changes in the online timetable.
http://usgovinfo.about.com/od/consumerawareness/a/dstextend.htm