76mike, I don't know of any companies that put in the gate coordinates anymore, we don't even have that information. It's an amazing coincidence that I actually flew out of DFW today, departed of rwy 35L en route to MSP, but I digress.
I don't think what you're asking is a big issue in 2013. How many non-GPS aircraft do you reckon are crossing the Atlantic nowadays, especially at the air carrier level? And yes, as Dave pointed out, the 2-mile error would have been done and gone by the time you made it to TUL, so I don't think it would magically reappear over water.