I am very new to this site, and want to buy a canon sx620 to take photos of planes passing overhead at about 1000 feet to land or taking off at a height between 5000 and 6000 feet. I live near the airport. Is the sx620 good enough? I realise it is only a point and shoot camera but it has 25 X optical zoom. Also any help with settings like shutter speed and ISO would be very appreciated.

Thanks a lot to everyone.