Originally Posted by DasKitty
that's what I get for not checking.

thanks, jani! I'll remember that next time in BRU.
In Concourse A all lounges are grouped together, accessed up a staircase / elevator close to Gate A32 (on your right just as you enter the main gate area from the shops). Other lounges in Concourse A include SN Brussels, SAS (Star Alliance) and a contract lounge catering predominantly for Lufthansa.
Concourse B has a BA Lounge for oneworld passengers, an SN Brussels lounge for SN passengers/elites, and a BMI Lounge for Star Alliance passengers. There is also a contract lounge serving smaller carriers.