Fort Lauderdale Airport Shooter Checked His Weapon During His Flight

Esteban Santiago allegedly went into a bathroom to load his gun before going on a deadly shooting spree.
1:54 | 01/07/17

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Transcript for Fort Lauderdale Airport Shooter Checked His Weapon During His Flight
I want to bring in Pierre Thomas, because Pierre, when people watching hear that he was known to the FBI, boarded that plane, checking his gun in his luggage and no red flags? Reporter: David, sources say as far as they know, and it's early, the suspect was not on any terrorism watch list or no-fly list. It appears the suspect was views as having mental health issues. David, we're in a gray area here, because there appears to be a reference to ISIS, though apparently the man was incoherent when he spoke to the FBI. This raises questions about authorities as airports should be notified when a person who may have mental health issues is flying with a gun and ammunition in checked baggage. David, has another gap in the system been exposed? Many more questions on this front. Pierre, thank you. You heard Pierre report the shooter checked his weapon in, perfectly legal, before his flight. Many now asking, what is the prose jurd when flying with guns? ABC's David Kerley covers aviation. Reporter: Somewhere tonight, someone is checking a firearm for a flight and it is perfectly legal. While the TSA confiscates hundreds of weapons at checkpoints in carry-ons, a gun owner who followed the rules can travel with a weapon as checked baggage. Which Esteban Santiago apparently did. The right way is, you take your firearm and you pack it at home. Reporter: TSA requires that the weapon is unloaded. It has to be packed in a hard case, plastic, wood or met that must be looked. And then when you go to check in for your flight, you got to check in at the counter and declare that you have a firearm. Reporter: But it's not just the unloaded weapon that's allowed in that case. Ammunition magazines and a small ammount of small arms ammunition which is boxed can also be carried. Checking a weapon in luggage compartment is a common practice. But neither the TSA nor the airline association could tell us, David, how many weapons travel each year. David Kerley on this, our thanks to you and the entire

This transcript has been automatically generated and may not be 100% accurate.

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