"gain a concession" is a correct and usable phrase in written English
You can use this phrase to refer to being granted a special allowance, discount, privilege, or other benefit. For example, "After negotiating with our suppliers, we were able to gain a concession on the cost of our raw materials."
In return, they gain a concession to operate the service under a contract that can last for decades.
It's the opposite of the more popular, foot-in-the-door technique, where you ask for something small, gain a concession, and then ask for something bigger.
Edward Renny-Tailyour, representing the Hamburg businessman Eduard Lippert an estranged cousin of Beit had been attempting to gain a concession from Lobengula since early 1888.
Gaining a concession of this magnitude, particularly from an oil giant, is a noteworthy achievement.
By gaining a concession that covered all of Mexico, Slim was able to capitalize on the cell-phone revolution, not only in Mexico but all through Latin America and even in the U.S. The other concessions gained by his competitors — the bank, the television channel, etc. — may not have been as well run and were nowhere near as lucrative.
But Mr. Levin has gained a significant concession from Mr. Braunstein on whether regulators were getting information on the bets "on a regular and recurring basis".
The occupation allowed them to gain a preliminary land concession from authorities, and from there, La Carpa began to grow.
A1 Compromise at U.N. Summit Despite pointed criticism of American environmental policy in Johannesburg, American officials gained an important concession in a plan for moving away from fossil fuel use.
In the agreement, Haley gained an "important concession": "I asked for and he gave his permission that at the end of the book I could write comments of my own about him which would not be subject to his review".
While Sanders has managed to gain a number of concessions vis a vis the Democratic Party platform, it remains to be seen if or how Hillary Clinton chooses to adhere to these principles (her recent VP pick hardly inspires confidence), or the extent to which the party's positions will be revised in 2020 should Hillary win the presidency in 2016 and face no Democratic challenger in the next election.
He later said that one of the reasons he did not run in the general election as a third-party candidate, after losing the primaries, was that, as a concession to gain ballot access in certain states, he had signed legally binding agreements to not run a third-party campaign if he lost the primary.
