If the chosen aircraft checks out, then the final negotiations and contractual relationships begin.

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It involves a tortuous set of contractual relationships between as many as 150 companies.

ECONOMIST: London Underground

The companies raise the funds and the authorities manage the tendering, governance and contractual relationships for the public sector.

BBC: Private Finance Projects debate

In a unified structure, he argues, contractual relationships are simplified and train operators are in sole control of their performance.

ECONOMIST: A better way to run a railway

That might stop GM from selling from its own storefront, as GM has contractual relationships with those dealers that stock GM.

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Western Union disclosed in February that the Department of Justice, joined by "several" states, is looking into the company's "contractual relationships" with the agents.

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There was an underestimation of how much work needed to be done, there had been changes of contractual relationships over time, and problems over resource availability.

BBC: Public Accounts Committee