He's actually quite right. I've made these pictures as example:
On a flat earth, a trip around the 55 S latitude would look like this:
http://img516.imageshack.us/my.php?image=triparound55slatitudevt7.jpgI did a few calculations. From the north pole to the south pole there is 12,500 miles. So the 55 S latitude must be 135 degrees from the north pole. Right, we all agree? Ok, now, one degree is equal to 69,44 miles (12,500/180). SO!
135 * 69,44 = 8680 miles from the north pole to the 55s latitude or the 135 degree.
So in order to find the route as shown above, you have to multiply 8680*2 with pi = 54,510 miles round. Now, that would take AGES even in an airplane
Well, for goodness sake, I will make an example with a round earth too.
http://img53.imageshack.us/my.php?image=triparound55slatituderehb6.jpgOn a round earth, the trip would be like this. Now, I don't know how to calculate it, so I did a path measurement in Google Earth. The trip? It was 14,500 miles long.
IN CONCLUSION:
A round earth trip:
14,500 milesA flat earth trip:
54,500 milesLet's say an average passenger jet flyes around
500 miles/hour.A trip around the round earth:
29 hrsA trip around the flat earth:
109 hrsThe rest is up for you to decide.