hi all,
walter is right, there's no delay: you can turn in to zürich app/dep and radar on liveatc.net and listen to the radio transmissions and you will see that it is real-time!
I track swiss planes departing and arriving EDDN and flying to zurüch or back on my radarbox. around stuttgart I lose contact normally but I then switch to zurich page in most cases the aircraft shines up a little bit south of stuttgart. so I track all these flights from EDDN to zurich in realtime!! it's really great!
regards