Which two non-aviation bombings affected airport security?

• A. The 9/11 attacks and the Madrid train bombing.
• B. The London bombings and the Bali bombings.
• C. World Trade Center 1993 and Oklahoma City 1995.
• D. The Anthrax letters and the USS Cole bombing.

Answer: (C)

Focusing on how major bombings outside aviation can still drive airport security helps you see why these two events are linked to tightening safeguards at airports. The 1993 World Trade Center bombing showed that large, crowded urban targets with heavy security can still be breached and that emergencies require rapid, coordinated response across agencies. That experience pushed improvements in threat assessment, surveillance, and incident management that airports adopt to protect these high-traffic environments. The 1995 Oklahoma City bombing highlighted the danger of mass-casualty attacks on critical infrastructure and the need for robust protective design, unified command, and coordinated emergency planning. Airports, as key pieces of critical infrastructure with constant passenger flows, borrowed lessons from these attacks to strengthen security planning, communication, and response readiness long before aviation-specific threats dominated security policy.

Other options involve attacks more closely tied to transportation modes or targets that did not spur airport security changes as directly or comprehensively as these two, which is why this pair is considered the best fit for affecting airport security in a broad, infrastructure-protection sense.