Icelandair's Hekla Aurora and 80th Anniversary livery planes

Does anyone know what’s going on with these 2 Icelandair B752s (TF-FIR and TF-FIU)? Are they both undergoing heavy maintenance? They haven’t appeared to be in active service for several weeks.

Both aircraft are in a heavy C check. Hopefully back in action in mid Juli

TF-FIR is in Hamilton

TF-FIU major C check at KEF

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Thanks for the info!