I've been on the hunt for an aerospace for a couple of months now. Can't recall where I read it, but I read that breitling keep parts to look after their watches for +25 years from manufacture. Plenty of people have sent their aerospace in for a major service and it comes back with a new module, often the latest version.
Value wise... I'm not entirely sure! Ebay is dead for them. I've had loads on my watch list and they just keep getting relisted. Early 2000s one would be a grand to 1200 i'd guess if mint with service history.
Recent ones here in sc have sat at around 1300 and gone to ebay. Earlier italic dial example has sat unsold at 900. A proper, recent breitling service would be ideal, and effect the price.