I am an American based in TLV and speak both Hebrew and English but find that when I speak English to travel service providers here - rental car counters, airline check-in etc. that I'm treated better (except in the security line where Hebrew gives a huge advantage). When TWA flew to TLV they were known for having surly flight attendants on that route as compared to El Al - I think they just didn't know how to deal with the Israelis.