The phrase "a longstanding advantage" is correct and usable in written English.
You can use it to describe a benefit or favorable position that has existed for a significant period of time.
Example: "The company has maintained a longstanding advantage in the market due to its innovative products and loyal customer base."
Alternatives: "a long-term benefit" or "an enduring advantage."
Connecticut has also had a longstanding tax advantage.
President Bush has also worked hard to blunt the Democrats' longstanding advantage on retirement issues by winning approval for a prescription drug plan for the elderly -- a huge new government entitlement program.
"We don't have to win the education debate to win the election," said one of Mr. Bush's advisers, acknowledging the Democrats' longstanding advantage on the issue.
Her attitude speaks directly to one of the biggest challenges facing the Republican ticket this year: countering the Democrats' longstanding advantage as the party more trusted to deal with Medicare.
But their persistent role in Republican administrations, from Ike's two terms down to Robert Gates's tenure as Bush's defense secretary, was deeply important to the G.O.P.'s longstanding advantage on foreign policy.
These groups are determined to overcome the longstanding advantage of the Republican National Committee, which has relied on its deep pockets and on sophisticated "microtargeting" from demographic data banks to locate sympathetic voters and get them to the polls.
President Obama has taken away Mitt Romney's longstanding advantage as the candidate voters say is most likely to restore the economy and create jobs, according to the latest poll by The New York Times and CBS News, which found a modest sense of optimism among Americans that White House policies are working.
Their new strategy: taking advantage of a longstanding federal program designed to encourage homeownership by insuring mortgages for buyers of modest means".
That is where de Castro and the rest of the FRD team have an advantage; each member has a longstanding career in fashion and is involved in the sustainable fashion movement.
A few scientists are arguing that the disease may be a longstanding but normally milder one that is temporarily flaring up as it takes advantage of trees stressed by weather or water conditions.
