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54North13West is quite a northerly track and the a/c possibly overflew Mancester outbound as it came from Frankfurt originally so a quick 180 and back to a place you know is a possible scenario, that and as pointed out by MAN777, the fact that SIA have staff at Manchester. Anybody got the track mile difference between EINN and EGCC from 54North?
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Looks to me it's about twice the distance. From a point 54N13W to EINN is about 163 nm and to EGCC is about 358 nm.