BOAC,
Data gathering has been very difficult, as every airline and manufacturer keeps this all very close. Just try to get the FOQA data on your last flight!
There has been some success, with 'blind' agreements with providers of real-time FDM, HFDM, FOQA, MFOQA data. Unfortunately, given the nature of the blind data, when an event is indicated, (by certain reactions of the aircraft systems) it is not possible to talk to the pilots to see what happened.
As an example, there are a few airports the US northeast, where there are crossing altitudes in/out of the airspace with a 500 foot difference in alt. In the data, you will see a TCAS event, but you really dont have a simple way to determine that this was a non-event.
Last edited by underfire; 1st Nov 2013 at 15:48.