what is the different between when and by that time

[moncsa001]

In future perfect and future perfect continous

Such as: By that time we arrive to the cinema the film will have started
When she arrive to the airport the aircraft will have taken off.
When we arrive to the cinema the film will have been going on for ten minutes.

May be Can I use both of time-clauses?

[5jj]

By that the time we arrive to at the cinema, the film will have started
When she arrives to at the airport, the aircraft will have taken off.
When we arrive to at the cinema, the film will have been going on running/showing/playing for ten minutes.

'By the time ... perhaps lays more emphasis on the lateness of our arrival than 'when'.

[moncsa001]

So I can use both of them. Just the "by the time" is stronger. Thank you.