UPDATE: The RCMP's Cpl. Lucy Shorey said the plane hired by PSAC appeared to have entered restricted airspace, and so the RCMP ordered it to land, she told the CBC. Mounties maintain the banner wasn't a concern, according to Canoe.ca.

This plane's critical message for Stephen Harper just won't fly. At least that's what the Public Service Alliance of Canada (PSAC) says the RCMP conveyed on Saturday.

The union has accused the RCMP of grounding a plane it hired due to its political message: A banner that read “StephenHarperNousDéteste.ca.” That translates to "Stephen Harper Hates Us."

PSAC planned for the plane to fly over Gatineau and Ottawa for three hours on Saturday morning, but landed after an hour and a half.

The union said authorities ordered the aircraft to land because it had entered Parliament Hill's restricted airspace, although the pilot reportedly knew about the restrictions and steered clear of them, a claim Nav Canada confirmed, according to Canada.com.

PSAC's regional executive vice president Larry Rousseau thinks the alleged order was politically motivated, 680 News reports.

"I think this was more about the message and taking down the message, because the message maybe hurt the prime minister politically," he said.

He claims the RCMP said the banner may qualify as hate speech and threaten Prime Minister Stephen Harper's security.

The RCMP have denied the union's allegations, saying they have no air traffic responsibilities.

In the past two weeks, planes with the banner flew over other communities as a part of the 'We Are All Affected' campaign.

Related on HuffPost:

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  • The Final Design

  • Prime Minister Stephen Harper boards his plane as he departs for a six day visit to South and Central America at the airport in Ottawa, Sunday August 7, 2011.

  • At one point, Harper staff directed the designer to mimic a flag found on the PM's campaign bus.<br><br>Conservative leader Stephen Harper and Laureen Harper step off the campaign bus as they arrive at the airport in Toronto, Saturday April 23, 2011.

  • Design Sketch

  • Design Sketch

  • Initial Belliveau sketch

  • Initial Belliveau sketch

  • Initial Belliveau sketch

  • Initial Belliveau sketch

  • Initial Belliveau sketch

  • Initial Belliveau sketch

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised sketch after PMO direction

  • Revised to more traditional look

  • Revised to more traditional look

  • Revised to more traditional look

  • Revised to more traditional look

  • Revised to more traditional look

  • Revised to more traditional look

  • CC-150 Polaris

  • CC-150 Polaris

  • CC-150 Polaris

  • CC-150 Polaris

  • CC-150 Polaris

  • CC-150 Polaris

  • CC-150 Polaris