Both Menzies and Servisair hire 18 year olds for EMA as long as you fulfill all of their other criteria, such as an ability to work shifts and transport yourself to the airport. My recommendation would be to send a cover letter and your CV (2 pages isnt too long at all, best to look over rather than under qualified) to both companies and wait to hear back. Include all your details in the cover letter ie why you want to work for them, what about the job you'd find interesting, what you'd bring to the company and your transport situation.