Pongo, you are a true ignoramus.
Note carefully the different heights in which birds migrate. If the earth were round, all birds would fly their great distances as close to the surface as possible as to shorten their journey. If you were flying on a sphere, the shortest line from point A to point B would be as close to the surface as possible. However, as you can see, birds have again proven the shape of the earth to be flat in their evolutionary endeavor to conserve energy. They do not have to worry about altitudes on a flat earth. The trip will be just as short at any altitude (minus the rises and falls to and from their flight height).
You have used proof by contradiction here (
http://en.wikipedia.org/wiki/Proof_by_contradiction), i.e. assume the earth is round, then derive a contradiction. In order to use proof by contradiction, you have to assume what you're trying to prove is false, i.e. that the earth IS round, in order to derive a contradiction in the statement "the earth is round," and therefore prove that "the earth is NOT round." In your own argument, you attempt to show that if the earth were round the birds would be expected to fly low; they don't, so it can't be round. HOWEVER, AT THE VERY SAME TIME, you DENY here that one can use the RE numbers to disprove RE:
Your numbers were based on assumptions gleaned from maps of a round earth. In particular, the distance variable. Therefore, they are sadly skewed to an erroneous model. I hope you did not spend long retrieving the numbers or on the calculations.
This was said by you after an RE'er tried to use RE numbers to show there was no inherent contradiction, in that the difference was only 0.05% between RE and FE distances, which is negligible. How can one show there is no inherent contradiction in a model without first being allowed to assume the model is true?
So besides the utter twaddle you have presented, you inherently contradict your own cause here. In conclusion, you are an idiot.