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sorry but i have to disagree with AV
the problem with using AV for birds in flight is the camera will usually expose for the sky leaving the intended target ( the bird in flight ) under exposed you would be better off setting the camera to manual and setting the aperture to F8 and shutter speed as high as you can get away with if you want to freeze the bird in flight
i usually point my camera at something neutral ( a tree for example ) to see what the exposure is at F8 to see what shutter speed i need for correct exposure if it's too low i will adjust the ISO to suite
the most accurate focusing point on your camera is the centre and obviously Ai servo for tracking
it takes a little time to get used to it but you'l get there in the end
seagulls make good practice as they tend to glide against the wind making there flight quite slow
i agree with not having your lens at full zoom and trying more towards 200mm to keep the images sharp
my favourite settings for anything in flight is 1/800th F8 and the lowest ISO i can get away with to keep those settings
good luck...
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