Translation of coincidental in German

Sometimes you forget one word and this makes the entire sentence sound differently. That means that you need to read each email before sending it twice at least if you want to be on the safe side every time.
Flying straight from Geneva to New York that does not exist, you must change planes in Zurich. You can also take a 3 hour train ride and then a connection to the airport with a local shuttle.
If you are spell checking my letters, that would be great. I would then do the same with your letters. Can you please correct this email too? I thank you in advance for helping my Spanish.