Which types of weapons are considered significant threats to aviation targets alongside bombs?

The choice referring to RPGs (Rocket-Propelled Grenades) and PGMs (Precision-Guided Munitions) is correct because these weapons have the capability to target aircraft effectively and can cause significant damage. RPGs are readily available in many conflict zones and can be used against low-flying aircraft, while PGMs are designed for high accuracy and can be employed to strike aviation targets with precision.

In the context of aviation security, these types of weapons are concerning due to their potential for use during attacks on commercial airliners or military aircraft. The increasing accessibility of such military-grade weaponry poses a real threat, as they can bypass more conventional security measures and are often utilized by terrorist groups aiming to inflict casualties on aviation-related targets.

Other weapon types, while potentially dangerous, do not pose the same level of direct threat to aircraft in a broader sense as RPGs and PGMs do. For instance, small arms and grenades may be less effective against aircraft flying at altitude. Biological agents and nuclear materials, while catastrophic in consequence, are generally categorized differently in terms of direct threats to aviation security; they involve different methodologies of attack and preparedness rather than the direct targeting of aircraft. Thus, RPGs and PGMs remain significant concerns