You may transport parachutes, either with or without Automatic Activation Devices, in carry-on or checked baggage.
Parachutes should always be packed separately from other baggage. If a Transportation Security Officer (TSO) determines that a bag must be opened to inspect the parachute, you MUST be present to assist the TSO in the inspection. If you are not within the appropriate screening area, you will be paged using the airport intercom system; if you are not present to assist with screening the parachute, the parachute will not be permitted on the plane. For this reason, passengers with parachutes are encouraged to add 30 minutes to the airlines' recommended arrival window. TSA is not responsible for repacking parachutes. All parachutes should be thoroughly inspected at their end destination to make sure that the equipment is still safe to use.
Even if an item is generally permitted, it may be subject to additional screening or not allowed through the checkpoint if it triggers an alarm during the screening process, appears to have been tampered with, or poses other security concerns. The final decision rests with TSA on whether to allow any items on the plane.