Ok, this may seem like a stupid question, but take pity am a newbie here!

I couldn't find an answer in the search function so i thought id post.

When looking on various air fare sites (AA.com/CO.com etc) the US site always seems to offer the same deal as the UK site just for a much cheaper rate. Can i book on the US site paying US$ with my UK credit card and UK billing address???

If no, is there any way around this???

It seems stupid to have to pay £240 to fly MCO-LAX, when on the american site it's about $200!

Chris