Are you sure they are the same planes that have been there for the last 3-4 days?? Often times when the Trans-Atlantic bank comes in, it is very common for the super-tugs to take them off their arrival gates (especially from Term B) and drop them off in the "Ball-Park" so that MX can do routine stuff and pre-ETOPS work on them before they go out in that evening's Int'l push. It is very common to have the Ball-Park looking like a 'used car lot' during the day time ops.

If they happen to be the same aircraft there for the last 3-4 days, you have some damn good eyes! I suppose CAL MX is in the process of doing "very through checks" on them. That's just a 'guess', the MX side of the house is in contract negotiations as we speak.