However much less critical runway incursions, the place planes have extra time to keep away from one another, are on the rise at Boston’s airport, the FAA information exhibits. That’s partly as a result of Logan’s crisscrossing runways and taxiways can create a congested atmosphere the place such incidents usually tend to happen, aviation specialists say.

“They’re all critical incidents to us,” mentioned Dave Ishihara, director of aviation companies on the Massachusetts Port Authority. “We need to find out about all these little security tremors which are occurring earlier than there’s an earthquake.”

These extra minor incidents make up the majority of such runway incursions at Logan since 2003, FAA information present. There have been 12 whole runway incursions at Logan in 2014, in response to the FAA information, a few of which had “no speedy security penalties.” Final 12 months, there have been 28. Whereas the quantity of air visitors at Logan has elevated since 2014, the variety of incursions has grown at a quicker fee.

Many extra trendy airports have been designed to not have intersecting, intently situated runways in city areas partly due to the incursion danger, specialists mentioned. However at Logan airport, which has expanded since opening within the Nineteen Twenties, its intersecting runways have endured at the same time as visitors has elevated.

“Basically, elevated operations improve complexity, which in flip will increase danger,” mentioned Mike McCormick, an assistant professor at Embry-Riddle Aeronautical College and former FAA management tower operator.

Massport goes to nice lengths to stop such incidents, Ishihara mentioned. Automated radar techniques detect airplane actions throughout the airfield and ship alerts to air visitors management. Pilots obtain verbal instructions that they need to repeat again. The taxiways have lights that flip crimson to alert pilots when they’re approaching an intersection with a runway and maintain lights on runways that sign pilots that they aren’t but allowed to take off.

Nonetheless, the FAA has designated 4 intersections at Logan’s airfield as hotspots for runway incursions since 2015, and people intersections include particular warnings for pilots about dangers, Ishihara mentioned. Massport is engaged on mitigations for every hotspot, together with relocating, including, or eliminating sure taxiways, and including runway entrance lights to a taxiway this summer time.

The intersection the place the February shut name occurred will not be listed as a hotspot. The Nationwide Transportation Security Board mentioned it’s investigating the incident.

The upward pattern in runway incursions is a little bit of a thriller, Ishihara mentioned, as a result of every incident is exclusive.

“If all of these incursions occurred at the exact same intersection at noontime, we might repair that,” he mentioned. “However as a result of it occurred on method, or it occurred after I was taxiing, or it occurred after I was on the runway, they’re in every single place. Which is why it’s important to layer the protection mitigations on high of one another, to make it tougher for the dangerous factor to occur.”

Massport and the FAA maintain annual security conferences to evaluation incidents, Ishihara mentioned. And every morning, officers from Massport, FAA, TSA, airways, and others maintain a security assembly on the airport the place they evaluation any points from the day before today and plan forward.

It was whereas these officers have been in that every day assembly on Monday when two United Airways planes collided at gradual velocity close to the gate space, touching wings. Three officers have been instantly dispatched to carry out a security evaluation, Ishihara mentioned. In August, two Delta planes equally collided close to the gate space at Logan.

The FAA doesn’t observe such slow-speed collisions close to the gate space, a spokesperson mentioned. However Massport does, in response to Ishihara. Such incidents are uncommon, he mentioned, and are usually not taking place extra ceaselessly. Consultants in contrast the incidents to “fender benders” that may trigger delays however are a lot much less critical than runway incursions.

Airways are alleged to have skilled individuals strolling close to every wing of an plane because it’s maneuvering close to the gate space to stop collisions, mentioned John Goglia, a former NTSB member and FAA plane mechanic. However the job has turn into tougher as jets have elevated in dimension and the area between gates has not, he mentioned.

A Delta spokesperson mentioned it’s the firm’s coverage to have skilled wing walkers, but it surely doesn’t hold data on this. United spokesperson Charles Hobart mentioned the airline had skilled wing walkers working through the incident this week.

“We’re working with our workforce to higher perceive how these two planes made contact as a part of our ongoing rigorous security work at Boston Logan and each airport the place we fly,” Hobart mentioned by way of e-mail.

John Hansman, professor of aeronautics at MIT, mentioned passengers shouldn’t be involved concerning the current security incidents at Logan. Equally, Ishihara mentioned it isn’t as if runway incursion hotspots are unsafe of their present situation. Hundreds of flights function out and in of Logan every week, maneuvering by these taxiways and runways with out incident.

“We must always monitor like we all the time monitor potential issues of safety,” Hansman mentioned. “If a sample exhibits up of — lack of readability within the clearance, or fatigue, or one thing — then possibly we’d do one thing.”

Goglia mentioned the pilot of the Learjet is prone to blame for final month’s shut name. That pilot learn again the directions from air visitors management to attend, the FAA mentioned, however “started a takeoff roll as a substitute.”

“There’s nothing exterior of the cockpit of that Learjet that anyone might have accomplished,” Goglia mentioned.

Goglia known as Boston Logan’s security file for the final 20 years “stellar” and mentioned the airport must hold it that approach.

“What occurs when every thing is ok and going clean is we begin to get complacent,” he mentioned. “That must be a priority.”

Boston Globe reporter Sarah Ryley and senior newsroom developer John Hancock contributed to this report.

Taylor Dolven may be reached at Comply with her on Twitter @taydolven.