Hi Paul !
Dunno for the mem, as my server has never reached such an amount of usage.
Concerning the abandoned aircrafts, you may look at these posts :
http://forum.1cpublishing.eu/showpos...54&postcount=1
http://forum.1cpublishing.eu/showpos...59&postcount=2
In the first post, you'll find a script which will delete planes left by players.
In the second post, you'll find a way for your airfields to remain clean
