<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Darren:
I need to get from the airport to the center of town and back to the airport in two hours.</font>
Where exactly in Brussels do you need to go? Zaventem Airport has an express train that goes to Brussels-Midi, Central and Nord stations, and the trains leave every 15 minutes and take about 20 minutes to get downtown, which should give you just enough time. Cheers.