I worked in retail at weekends while attending college 5 days a week for two years. The experience of working within the airport, working shifts and also the contacts I made at the airport went a long way in helping me get my dispatch role
Airports are usually quite tight 'communities' and you'll soon start to meet various people from various companies who can usually pull some strings in helping you find out and get jobs.
Getting your foot in the door is the hardest bit, whether it be cleaner, burger flipper or dispatcher