Good security
To add to Sunfish's comments:
Don't even complement security on doing a good job, where you see one done... Thorough computer checking, efficient arms and weapons body check, whatever.... That also get you added to the suspect persons lists.. and guarantees the 4 S's on your boarding passes in the states (full security ritual).
Silence and in case of an event - whatever self-defense is possible are the best suvival kits available