ATLANTA (VINnews) — An unauthorized Wi-Fi network that appeared to impersonate Delta Air Lines’ onboard service was detected Monday on a flight from Las Vegas to Atlanta, prompting the crew to temporarily disable the aircraft’s legitimate Wi-Fi, the airline said.

Delta Flight 591, a Boeing 757 carrying 199 passengers and six crew members, was en route from Harry Reid International Airport in Las Vegas to Hartsfield-Jackson Atlanta International Airport on Aug. 10 when the rogue network was discovered. Cabin crew shut down the plane’s Wi-Fi for about 30 minutes as a precaution. No emergency was declared to air traffic control.

Delta said an initial review confirmed the network was not provided, operated or supplied by the airline. The company stressed that no Delta systems, including the in-flight Wi-Fi, were hacked and that flight safety and aircraft operating systems were never affected.

Messages attributed to the flight crew, which circulated among aviation trackers, reported concerns that a passenger had created a network named “Delta WiFi Fast” and may have been attempting to scam others. A follow-up message referenced a group of passengers who had attended a cybersecurity conference in Las Vegas and indicated the legitimate Wi-Fi had been jammed while the unauthorized signal was broadcast.

The flight departed shortly after the conclusion of DEF CON 34, one of the world’s largest cybersecurity and hacker conferences, which ran Aug. 6-9 in Las Vegas. Delta is investigating whether any conference attendees were involved.

“Safety of flight was never in question, and no aircraft operating systems were affected,” a Delta spokesperson said. “We are fully investigating to gather a complete set of facts, which will take time. We will partner with federal law enforcement and aviation regulators to ensure the incident is thoroughly investigated.”

The Federal Aviation Administration said it is aware of the report and is looking into it. The agency noted that any issue with onboard Wi-Fi would not affect an airplane’s flight-safety systems.

Federal authorities have previously warned about “evil twin” attacks, in which a fake network mimics a legitimate one to potentially capture user data. Whether malicious intent was involved in this case remains unclear, and Delta said it has not determined whether any passenger information was compromised.

The investigation is ongoing.