Chicago architect Helmut Jahn has sent a hand-written note to the Chicago Tribune condemning the selection of a team led by Jeanne Gang to design an extension to O'Hare airport, describing it as "premeditated" and "not justified".

Jahn deplored the decision taken by Chicago mayor Rahm Emanuel in the note sent to the newspaper's architecture critic Blair Kamin, who then posted a photo of it on Twitter.

Jahn "embarrassed" by Chicago's decision

"I am embarrassed that some of my most respected colleagues have been misused to placate [a] premeditated decision not justified by design or experience," read Jahn's letter, which was written in all capitals using magenta ink.

"Such attitude has not made Chicago a capital of world architecture," it continued. "Hopefully the next mayor will turn this around." Jahn then signed and dated the note.

Gang's team, called Studio ORD, comprises Chicago's Studio Gang, Solomon Cordwell Buenz, Corgan, Milhouse Engineering and Construction, and STL Architects.

It was announced as the winner of the competition for a new concourse and terminal at Chicago O'Hare International Airport on 27 March 2019, beating competitors including Foster + Partners, SOM and Santiago Calatrava that were shortlisted earlier this year.

Architect suggests selection process was unfair

After the five shortlisted proposals were revealed in January 2019, the public was encouraged to vote on their favourite design.

Jahn, who designed the 1987 United Airlines Terminal One at the same airport, is skeptical as to whether the jury's votes for Studio ORD's proposal took this into consideration, with his note implying that the selection process was unfair.

He was also critical of the city's mayor Rahm Emanuel, who previously served as White House Chief of Staff during Barack Obama's presidency. The mayor, who has held office since 2011, has been under harsh criticism during his time in office, with low approval ratings.

Jahn sent the note to Kamin, who produced a critical piece on Gang's airport design for the Chicago Tribune. The story highlights the difference between the public's preference and the final decision given to Studio ORD.

"In the city's own online survey of more than 41,000 Chicago residents, travellers and architecture buffs, Gang's design for a curvaceous, Y-shaped terminal that would replace O'Hare's existing Terminal 2, came in third in a field of five, well behind plans from Zurich-based Santiago Calatrava and London-based Norman Foster, both of whom have far more airport design experience than Gang," said the article.

While Kamin commended the "extraordinary talent" of Jeanne Gang in the article, he added that the team's design didn't "soar" in comparison to the others.

Among the critiques of Studio ORD's Y-shaped airport design is its similarity to Calatrava's Oculus at the World Trade Center in Manhattan. Matching features include an Oculus, for the main concourse lounge, and a roof layered in slats and skylights.

Gang defendants tell Jahn to "take a flying leap"

Others, however, have taken to social media to voice support of Gang and her scheme.

These include Cameron Sinclair, the former head of social innovation at Airbnb, who tweeted that Jahn should "take a flying leap".

Sinclair's tweet also highlights the importance of female-led projects: "The era of 70-plus year-old dudes automatically assuming they will divvy up the commissions are over. #precoffeecritique #endtheoldboysclub."

Jeanne Gang has made efforts to improve gender diversity in the architecture industry. In a 2018 interview with Dezeen, she said that more needs to be done to root out sexism in architecture.

Her moves include closing the gender pay gap at her firm Studio Gang, and calling for others to follow suit to "fix pay inequity".

Jahn, 79, is a Chicago-based German-American architect who is best known for the postmodern James R Thompson Center, which has been the subject of major controversy due to plans for its demolition.

The architect's more recent works include the 1000M skyscraper designed for the city's South Loop.

Jahn joined C F Murphy Associates in 1967 and took sole control in 1981, renaming the firm Murphy/Jahn. In 2012, the architecture studio was retitled Jahn.