There's a lot of planes up there

Given the couple of plane crashes recently, people's perceived risk of air travel can be increased.
That's why I think videos like this one from NASA are good, as they show how many planes are flying at any one point (over the US in this example). It looks pretty busy up there :)

However, if you do want all the morbid details, the Aviation Safety Network Database contains details on all the plane accidents that have occurred. This could really put you off flying :)