Cargo Aircraft Only marking is used on lithium battery shipments to indicate that shipments must be transported by cargo aircraft.

• A. When shipments must be transported by cargo aircraft
• B. When shipped on passenger planes
• C. When the labeling requires special handling
• D. Always on all hazmat shipments

Answer: (A)

Cargo Aircraft Only marks are used to show that lithium battery shipments must be transported by freighter aircraft, not by passenger planes. This designation communicates a mode-of-transport requirement because lithium batteries pose certain safety risks that may demand the specialized systems and space available on cargo aircraft.

Think of it this way: some battery shipments are restricted to cargo aircraft to ensure the appropriate safety measures and regulatory compliance can be met. It’s about how the shipment will be moved, not just how it’s labeled for handling.

Shipped on passenger planes doesn’t fit because the marking signals the opposite—that passenger-plane transport is not allowed. Labeling that requires special handling describes conditions for handling the package, not the transport mode. And labeling that’s used on all hazmat shipments would be incorrect since not every hazmat shipment is restricted to cargo aircraft; many can be moved on passenger aircraft under specific allowances.