Estimated Time of Arrival (ETA) performance system comparative evaluation

■ Considering all estimates at all fixes across all systems, the standard deviation of ETA error is within the performance requirement for both absolute and relative errors ■ Considering individual systems across the full flight plan, - there is little effect on ETA error either from the flight phase where the fix is located OR the flight phase where the aircraft was when the ETA was calculated - With times to go > 20 minutes, ETA errors are relatively consistent and less than 1.5% - Several systems meet the 10 sec for the full 10 minutes where it applies and most meet it for at least 7 minutes ■ Overall, it appears that lateral and vertical profiles are integrated well in all systems, it appears that wind models may account for most of the non-compliance