We've always wondered why some of the European airlines always check in on our frequencies saying "and we're an xxx". I always feel like telling them "congratulations! That matches your datablock!"
Is that really an issue over there? In my 25 years working here at N90, I can't recall a single instance of an airliner coming in as one type, and turning out to be another. That's more likely to happen with one of the many general aviation aircraft we have buzzing around in VFR flight plans, but an airliner on a regularly scheduled flight plan?