Attacks at airports are rare, and Tuesday’s bombing at Brussels Airport will no doubt have repercussions around the world. Which airlines will see the worst financial impact from the attacks? Brussels Airlines, not surprisingly, is most vulnerable. Unfortunately, the airline is not starting from a position of strength. Its 2015 earnings report released last week depicts an improving airline, but not quite a healthy one.

Lufthansa is another airline likely to see revenues suffer in the wake of the attacks. And although the Lufthansa group is certainly a strong company, its fourth quarter earnings report was a disappointment. Lastly, will the Brussels bombings usher in another wave of security measures at airports around the world?