Police and passengers outside Queenstown Airport after a note about a bomb was found on a plane.

Police are still trying to find the passenger who left a note about a bomb on a plane in Queenstown.

The airport was evacuated, although flights still took off after 3pm, when emergency services were alerted to the note. It was discovered by a cleaner after passengers had left the plane.

The note contained information about a bomb, but a police search found there was no evidence of an explosive on board or in the terminal.

1 of 4 NATHAN HODGE/SUPPLIED A note about a bomb was left in a plane that landed in Queenstown, forcing passengers to be evacuated from the terminal. 2 of 4 NATHAN HODGE/SUPPLIED Police and passengers outside Queenstown Airport after a note about a bomb was found on a plane. 3 of 4 NATHAN HODGE/SUPPLIED Police and passengers outside Queenstown Airport after a note about a bomb was found on a plane. 4 of 4 NATHAN HODGE/SUPPLIED Police and passengers outside Queenstown Airport after a note about a bomb was found on a plane.

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Baggage and the terminal building were searched and authorities were making inquiries with passengers. While the building and plane were cleared, passengers were kept outside the airport and were not allowed to leave.

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DASHA KUPRIENKO/SUPPLIED Students from Sydney wait in the cold at Queenstown Airport after a bomb scare. The group ended up dancing to keep warm.

A police media spokeswoman said a cleaner found the note on the plane after it landed and alerted police.

supplied Queenstown Airport has been evacuated after a note about a bomb was found on a plane that had arrived from Sydney.

The flight, Qantas QF121, had come in from Sydney on Sunday.

Chris Greenshields and his daughter Lillian,4, were catching a flight to Christchurch and said they had to wait outside in a cold for more than an hour.

"It is what it is, we can't do anything about it. They [airport staff] obviously have their protocols to follow and have our safety in mind," he said.

Greenshields said blankets were offered to evacuated children.

Meanwhile, a group of students from Sydney were dancing off the cold while waiting.

Callum McGlinchey said he was the last one to evacuate and thought the sirens were a fire drill.

"The whole airport cleared out in a minute.

"The time we were scared was when we heard a loud noise after we evacuated. We weren't sure of where and what it was, but it was a plane taking off," McGlinchey said.

Another student, Brendan Dawes, said who ever left a note on the airplane was "childish".

Queenstown Airport Corporation communications manager Jen Andrews said the terminal was evacuated while staff waited for more information.

Andrews was contemplating issuing a statement later.

"We will be talking to the airline about that. I will let you know."

Police investigations were continuing.