The best way I've found is to wear them in a carrier and just walk around the airport for a little while. (havebabywilltravel.com)
You always have the choice to check a stroller in like baggage, but a travel stroller is useful while walking around airports. (earlymomentsmatter.org)
Don't forget to ask about covering your meals if you're going to be waiting around the airport for more than a few hours. (thedigeratilife.com)