I have never noticed that before!!
I thought it came only once but as can been seen in the take off photo it left with neither a Court or Air Canada markings so either it came 3 times or indeed they were pealed off.
(Edit) Just spotted that in the last photo the Clarksons sticker is missing off the third tail engine which has writing on it instead, so now I have no idea how many times it came to Luton.
