If each member of Oneworld calculates there frequent flier miles differently, then how do they convert the miles from one airline's frequent flier mile program to another???? For example, if you're lucky and can get an American Airline Economy transatlantic flight from N. America to Europe it takes 30,000 miles. But, I thought on British Airways's web-site it says that a transatlantic flight from N. America to Europe costs 50,000 miles. Am I correct in assuming that BA wouldn't take 50,000 of your AA miles to fly with them on a transatlantic flight, but would take 30,000 or some other similar converted amount? Does anyone know the conversion between AA and the other Oneworld Partners?