Passenger without a ticket boards a Delta flight from Seattle to Honolulu on Christmas Eve

A ticketless passenger was found aboard a Delta plane on Christmas Eve, airline officials said.

That’s coming in just a few weeks after a stowaway was caught on another Delta flight. According to the Transportation Security Administration, the passenger in this week’s incident went through standard security checks but bypassed identity verification and boarding status stations and boarded a plane, an Airbus A321neo, at Seattle-Tacoma International Airport.

Although the flight took place on Christmas Eve, investigators determined that the ticketless passenger had passed through a security checkpoint on Monday evening a day earlier, Port of Seattle police said. The passenger “gained access to the loading bridge without having a scanned ticket at the gate,” Port of Seattle police said.

The ticketless passenger was found before Flight 487 took off for Honolulu, but while the plane was taxiing onto the runway, according to the airline.

According to police, the suspected stowaway got off the plane as it returned to the gate and was located by police using video surveillance in a restroom in the terminal. The unticketed passenger was arrested for trespassing and booked into the South Correctional Entity prison in Des Moines, Washington, according to the Port of Seattle.

The person has not yet been publicly identified.

The flight was delayed for 2 hours and 15 minutes while the TSA conducted additional security checks, including re-screening customers. Police said the plane was swept by K9 dogs, in addition to areas in the terminal that the passenger entered without a ticket.

The TSA is still investigating how the suspected stowaway managed to get on the plane without presenting a boarding pass.

In last month’s case involving a Delta flight from New York City to Paris, Svetlana Dali According to a criminal complaint, she tried to stand in line at the Transportation Security Administration checkpoint but was turned away because she couldn’t show a boarding pass. A short time later, she successfully sneaked out after allegedly entering “through a special lane for airline employees, masked by a large Air Europa flight crew.”

“Delta agents, who were busy assisting ticketed passengers to board, did not stop her or ask her to present a boarding pass before she boarded the aircraft,” the criminal complaint states.

Dali was arrested in Paris and flew back to New York on December 4th. She was taken into custody and is charged with obtaining transportation on an aircraft without consent or permission. Dali was later arrested in Buffalo on a bus to Canada after her ankle monitor was allegedly cut off.