My cloudy Vancouver shoot also gave me the chance to play around with some lower shutter speeds.  I have done this for the turboprops before but this time I decided to play with some of the jets.  A really low shuttle speed can blur out the background and give a nice impression of movement but it is a problematic shot to make.  You don’t want to do it on something that you are keen to get in case you get nothing!  It is also something that results in very small apertures if there is much light which can make for a lot of dust spotting in post!  A cloudy evening is a good time to try and a bunch of boring regular jets are good targets for a trial!