Well to make aviation safer, you first need to understand and acknowledge the biggest outstanding safety concerns. The two biggest threats to aviation safety today in my opinion, are
-> 1) Terrorism/Deliberate acts of terror
-> 2) Pilot Fatigue
How can we make aviation safer then? Well in my opinion, better security with better CCTV monitoring, and tightening regulations in the aviation industry that limit the amount of time a pilot can work in shifts even more. As it stands now, a large number of airlines, even the most lucrative such as that of Emirates reprimand and sanction pilots for even complaining of tiredness or an inability to work due to health reasons.