I've done that flight twice. In coach you will be more comforable if you can take along some sort of a cushion or support for your back. As recently as June, the 767's have not had seats removed to give you more room.

The Zurich airport is under construction. Some of the signs are confusing. Try to find out in advance if you need to check in at the 'in transit' desk if you are catching another flight. When I was there, I was told 'yes' 'no' and 'yes'.

Security is very serious including body pat downs for everyone. Allow plenty of time for such.