According to the Barrhead Travel site they are Saturday departures. I've flown on the LCY fleet a few times and also on a charter to CMF with Esprit Ski. Thery are comfortable and very roomy and a cut above the usual TOM and TC charter stuff to PMI.
The only issue is the flights are weekly. I tend to get bored after 10 or so days in the same place so like to keep holidays to around 10/11 nights.