As the horror of the tragedy unfolded, a frequent response was astonishment that guns could be carried in checked baggage on commercial flights.

Yet the rules on flying with weapons and ammunition are based on a simple premise: that an individual who is legally entitled to possess a gun in a particular locality – a country or US state – should be able to transport the weapon.

Airlines insist that they are told in advance: some, like British Airways, demand three days’ notice. But within the US, where possession of firearms is commonplace, the airlines simply ask that you tell them at check in.

The gun must be unloaded and packed in a locked case inside your checked baggage. Some countries have additional restrictions (for example South Africa and Italy insist that the weapon and the ammunition are in separate cases), and airlines typically limit the amount of ammunition to 5kg. But transporting guns is an everyday activity.

At the end of each journey, the passenger picks up their weapon and ammunition from baggage reclaim, or occasionally a separate desk in the baggage hall. Usually they then leave the airport. But there have never been any restrictions to prevent an atrocity of the sort that took place in Florida’s second-biggest airport last weekend.

Aviation security is focused squarely on a particular threat: that armed hijackers could once again take over an aircraft, or attack it by some other means. So everyone, and everything, that goes “airside” is screened very carefully. But people accessing “landside” areas of airports are not screened. And that includes arriving passengers. Once you’re at baggage reclaim, the thinking goes, you’re not getting back on the plane.

A top safety expert says the casual approach to transporting weapons must now stop. Adrian Young, senior aviation consultant for the Dutch firm To70, has called for swift action to prevent a repeat of the Fort Lauderdale massacre.

“A quick fix would be to have weapons handled as dangerous goods,” he says. “That’s what they are, after all. They should be checked in and collected at cargo areas, or at least areas away from the passengers.”

Mr Young concedes such an arrangement would be “not very convenient for the gun owner”. But, he says: “My view is clear. It’s about keeping weapons away from large groups of people.”

In the US, and other countries, a murderer with a gun need not arrive on a plane to cause mayhem at an airport. The domestic baggage reclaim area in American airports is usually adjacent to the roadway with just a glass door between, because it helps people to have only a short distance to walk to their cars. Sometimes there is a dedicated security presence at baggage reclaim, but in my experience that is aimed at preventing theft of luggage from the area, rather than deterring armed attackers.

The Fort Lauderdale attack appears to be a random shooting event of the kind that are sadly common in the US, which happens to have taken place at an airport, rather than an aviation security incident involving terrorism. Even so, it raises important challenges about keeping passengers and staff safe.

Evidence from the attacks at Brussels and Istanbul airports last year suggests that the better we get at preventing terrorists boarding planes, the more they switch attention to high-profile aviation targets that are poorly protected. And that means airports.