Agreed and thanks for describing/writing that better than I ever could!

Wow what great responses to my question - thank you all very much :) Interesting to see how its a regular occurence in some countries but not in others. The bit about taxiway departures was cool - I didnt know those even happened! Makes sense though for small planes at massive airports. I also did not know that the level of detail FMS systems held - down to airplane performance from X intersection @ X airport! Impressive! The wonders of computers.About wake-turbulence....correct me if Im wrong but planes like Fokker 50, Caribou etc...if they drop lots of flap and then depart they can climb more steeply than a jet right....and so get above and well away from a preceding heavies vortex?