2025 is the current date that Sentry has "planned funding" for (subject to Government whim of course) - obviously, more money will have to be found if it is to be taken past that date, which is perfectly possible within the life of the aircraft. The upgrade of the different AWACS fleets has been the subject of debate for many years, and different operators have tried different solutions with different companies for the mid-life upgrade of the mission system. During my period with Sentry many of these were subject to Commercial in Confidence caveat and I certainly do not intend to discuss the current situations of the fleets - just in case. Nor is it wise to start to compare capabilities and operational matters concerning mid-life updates. I would leave things rest.