Present Simple (I do) with a future meaning.
We can use the Present Simple when we talk about timetables, programmes, etc. (For example, for public transport, cinemas etc)
- The train leaves Mumbai at 9.30 a.m and arrives at Bilaspur within 16 hours.
- What time does the film begin?
- The film begins at 6.00 p.m.
- We have a bus now going to Thiruvanathapuram. It leaves at 9 a.m.