CemAir signs for two new Q400 aircraft MRO Business Today 21:19 CemAir signs for two new Q400 aircraft CemAir, a privately owned airline operating in South Africa has concluded a firm purchase agreement for two new Q400 turboprops, and has also signed the lease of a used Q400 aircraft. The letter of Intent (LOI) from CemAir, which was signed at Share this Share on FacebookTweet on TwitterPlus on Google+