I understand that the downloadable apps have some sort of displaying the gate number, at least for LHR.

However, those applications are completely useless for non-BA joint business (AA/BA/IB) customers: as a top-tier oneworld emerald the app won't even let me display my own itinerary (even by record locator), nor will it show gate numbers.

Any back-way I'm not aware of? As a US-based flyer, where all the airlines will give you that info online, it's mysterious to me why BA wouldn't, especially when LHR T5 has 3 terminals far away from each other.