Can the aliens be here already?

Hey everyone, there has been lots of threads about different dates of aliens landing on earth but none of them have come true. But what if they are already here and we just dont know it YET. I have been looking in the sky lately and noticed some weird things flying at night. And trust me i know how to spot a plane from a ufo. I also noticed how the clouds form up sometimes. They are somtimes all lined up beside eachother or in the shape of a huge aircraft which is kind of freaky. So do you guys think the aliens are here or not.

I read the thread with the open letter to the prime minister of canada (harper) and i just cant wait to see what happens on september 17th 2007.