Servisair are the main handling agent for flights from the City and Menzies runs a cargo operation.. At the international Servisair run passenger and cargo operations with Menzies just focusing on passenger flights at the minute
Servisair at the international is probably staffed enough for a long time, as they took on most of the aviance staff, infact it wouldn't surprise me if there are redundancies come winter time. Menzies will be your best bet for summer work and also the chance of a casual or reduced hour contract in winter