BNEA320- You may care to read your regs. ATSR 2005 prescribes requirements for airports requiring Transport Security Programs(TSRs) and you will find that the Q400 sits in the category that requires screening and while charter up to 20,000 kg is allowed without screening there is pressure to reduce that and in fact the draft regs that are being discussed move to more stringent requirements, brought on by political pressures of course. Over 50,000 passenger per year is another requirement. The triggers impose costs on airport owners which of course are passed on to operators and ultimately the passengers. I think the Saab and older Dash 8 are fine at the moment. Of course we could move to more efficient and cheaper(less safe) overseas models but at what cost?