Hi, I have a question that I have been thinking about for a while now. It seems that whenever I am on an A320 the wing seems to go clean (flaps/slats in) very quickly on take off and also seems to stay clean until just before landing. I notice the 737 seems to clean up much later on climb than the A320 and also seems to extend much sooner on slowing for landing that the 320 does.

Is this my imagination or is there something to this? Why does the 320 wing seem to get clean so much faster than the 737 and stay clean so much later?

Thanks!