Amid the midnight revelry around the Buchanan Air Field in Concord, there were noises that sound very much like gunshots, just as a small plane was making its final approach for landing.
"You don't want to get hit by these things," said Roland Williams, a flight instructor.
"It could kill you..." says a flight instructor at Concord's Buchanan Field about celebratory gunfire near airport. pic.twitter.com/EY0GAYMNjS— Laura Anthony (@LauraAnthony7) January 2, 2016
The plane wasn't hit, but veteran pilots say it's a situation that could prove deadly.
"It can kill you. it can kill you because it hits you. It can kill you because it can disables you and you end up breaking the airplane, and it can damage the aircraft," said Williams.
Planes typically fly at 1,000 feet or lower around Buchanan, sometimes as low as 500 feet over the neighbrhood to the north, where residents say at least some of Thursday night's gunfire came from.
There were illegal fireworks, too. But those typically pose no danger to planes.
Ralph Neumeister is a flight instructor and former commercial airline pilot. He's not that worried about bullets.
"I'm probably more concerned about birds, drones or lasers," shared Neumeister.
Depending on the cartridge, scientists estimate a bullet fired straight up in the air can travel as high as 10,000 feet.
In California, discharging a firearm into the air is a felony.