|Quoting sierra3tango (Reply 2):|
Quoting YXD172 (Reply 1):
You've got it! Most schedules have different timings before and after the time change, especially when flying between two airports that change to/from Daylight Savings Time on different dates (such as North America to/from Europe, where flight times in between the changes are different for a few weeks.
Don't think I have got it ! The point was that (most) inbounds from the east (not so sure about the west) were arriving an hour (local time) later than normal (but the same time UTC), or to put it another way they must have departed their originating airports at the same time as 24 hours previously. So do they have a faster turn at LHR around to go out on schedule??
There are a few slot changes that take place in the very early mornings.
During the Winter scheduled the first arrival is normally at 04.40 GMT from Boston this advances to arrive using a 06.15 BST slot in summer timetable.
During the northern summer the first scheduled arrive is at 04.50 BST and is from Singapore.
Clock change always takes place Sunday am and Heathrow actually has some flexibility - Not all slots are used till about 11.00 am as many inter European business services don't operate.
It really isn't that difficult.
What does cause more scheduling issues are the few weeks when the US States (That change the clocks) and Canada are out of sync with Europe in Early March add the winter high winds and you get the situation where US inbounds with scheduled slot times of 06.00 -07.00 can enter the TMA as much as an hour and half early!
Due to the slot limitations before 06.00 these end up entering the stack for as much as 40 minutes before being vectored.
All European countries sync the clock change and as LHR
has virtually no InterEurope over night traffic the schedules are not effected.