There was an issue a few years ago in Chicago where planes at the airport were losing GPS reception, which was eventually traced back to a truck driver who used

There was an issue a few years ago in Chicago where planes at the airport were losing GPS reception, which was eventually traced back to a truck driver who used a jammer to avoid fines based on GPS tracker data on the rental trucks he was assigned to drive. He wasn't intending to crash an airplane, just avoiding docked pay for driving in traffic, using a $50 device bought online, and his route took him past O'Hare. The perpetrators aren't playing around to try to crash an airplane, they're merely polluting an invisible commons in their own self-interest, and aviation happens to need that spectrum to be clean.