An airlines crew training program including simulator forms part of its Operating Certificate and is approved by the local aviation authority (CAA). Having had the program approved annual audits by that authority will ensure that it is being maintained.
Most airlines follow a four sessions per year format at three month intervals - two as base checks for licence & I.R. renewal and two as re-current training, one of which will usually be a Loft Program. The more budget minded outfits reduce it to two sessions and try and pack every thing in to the two sessions.
