Some airlines take on temps over the Summer period.
I have a friend at ServisAir who worked there last Summer and does the occassional weekend nowadays. He works in dispatch, but I'm not sure if there's usually potential for much more than passenger services/checkin.
Best thing to do, I would say, is get a list of airport operators from your local airports website and send a CV off to them. Keeping an eye on relevant jobfairs might be an idea too.