For most aviation pics around the airport I use a shutter pri, of 500 and then the F number should be around 8-11. I always underexpose 1/3 – 2/3 on sunny days with my 350D. ISO 100. I use the 70-300 IS USM. See my pics in the links below, EXIF info is on the Jetphotos pics.

your setting of 1/80 means you let in to much light hence overexpose like the pic shows.