http://www.airport-technology.com/glossary/concourse.html
Definition:
An airport concourse is a large open area for the gathering or passage of crowds.


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Note added at 16 mins (2010-03-03 15:00:03 GMT)
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صالة إضافية في المطار

Hong Kong airport opens new North Satellite Concourse
Posted Fri, 12/25/2009 - 06:06
To ensure the same level of service for the growing number of passengers flying on smaller aircraft, the Airport Authority has invested over HK$1 billion in the construction of a new North Satellite Concourse (NSC). The new concourse, which will be soft-opened on 17 December, will ensure that Hong Kong International Airport continues to meet its performance pledge of embarking and disembarking more than 90% of its passengers by air bridges. The NSC is designed to serve more than five million passengers a year at the initial stage.

Situated to the north of the Terminal 1 (T1), the NSC is a two-storey facility equipped with 10 frontal stands (gate numbers: 501 to 510) for narrow-bodied aircraft. Passengers using the new concourse depart as normal, completing their check-in, immigration and security procedures in either T1 or T2 before proceeding to a designated area at T1 to board a shuttle bus for the concourse. Waiting area of the concourse houses 10 retail and two catering outlets. Departing passengers may also take the shuttle to T1 at any time. Shuttle buses to and from the NSC will run every four minutes.
http://www.airportcentral.com/hong-kong-airport-opens-new-no...

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Note added at 17 mins (2010-03-03 15:01:19 GMT)
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أو الأفضل أن تقول: صالة الركاب التابعة

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Note added at 40 mins (2010-03-03 15:24:56 GMT)
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صالة الركاب الملحقة

i think باحة can describe th term better.

www.almaany.com