The delay in finding objects of interest from satellite imagery will no doubt be due in part to the need for many eyes to painstakingly assess each image,of which there must be thousands.
Yes the Minister explained that the whole area is shrouded in cloud and the French had done a great job in homing in on the few gaps that cropped up from time to time and then spotted the 122 objects. The images are dated 23rd March, was that 23rd March at Airbus in France (and possibly 24th in the Indian Ocean) or 23rd March in the search area? Either way, as you imply, this all takes time.