26th July
Here is what is confirmed so far
BAW1326/7 (LHR-LHR) ETA1110 ETD1230 B747-400
UAE35/6 (DXB-DXB) ETA1205 ETD1335 B777-300ER
KLM957/8 (AMS-AMS) ETA1035 ETD1305 B737-800 (Probable retro-schemed PH-BXA)
Also to this will be Mr Meeson from Jet2's DH Rapide which will open the celebrations (time TBC), and Jet2 B757 G-LSAE has had the 75th Anniversary titles added to the fuselage already.
The Sunderland Airshow also takes places on 24th/25th July, so would guess that some of the participants may remain at NCL on the Monday, possibly including the Red Arrows.