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It’s just a guess but I think that Ryanair may be purchasing a new plane.  This Boeing 737  landed at Prestwick this morning and was parked in front of the Ryanair hangers.  The plane is currently owned by the Wells Fargo Bank and has been in storage at Shannon airport since last year.
 
Flight Radar has shown her as moving about on the Apron all day but when I popped round for a look at lunchtime she was nowhere to be seen.  Most likely reason is she was already in the hanger for a quick inspection.
 
Time will tell.