Hi again,
following grunt087's hint I found something about the Victory Day rehearsals for Moscow on wikipedia, see the link below. Based on that May 4 to 6 would give more options to see the aircraft flypast than taking the risk for may 9, plus spending several days before.
Has anybody done the 'multiple practice days'?
https://en.wikipedia.org/wiki/2019_Mosc ... Day_Parade
Timeline for preparatory activities in Moscow
26-27 March towards 6 April – beginning of parade practice runs in Alabino, Moscow Oblast
2nd up to the 3rd week of April – General practice run-through in the Alabino training field, including flypast[6]
4th week of April until 2 days before Victory Day - practice runs in Red Square right up to the general practice run
26–30 April, 2–6 May – evening parade practice run-throughs
4–5 May – Air flypast practice runs
6 May – the general practice run at 10 am MST (set to be livestreamed)