The two A340s that are operated by Air Namibia now are very close to their max airframe hours. Their lease was supposed to run out somewhere between September and November 2012. However, by then there wouldn't have been enough time left to find a different lease customer for them, but too much to simply scrap them. So Air Namibia was made a very good offer on the extension of the lease in order for them to "finish off" the hours left on the air frame, before exchanging the old A340s for newer A330s. Apparently the conditions were good enough to compensate for the higher operating costs during the extended lease period of the A340s.