Conversations to further simplify and expedite US visa approval for Bahrainis are continuing on a government-to-government level, building on the recent extension of tourist visa validity from five to 10 years, the American ambassador revealed on the sidelines of the Bahrain International Airshow (BIAS) yesterday.Responding to a question by the GDN, US Ambassador Steven C Bondy said that he was happy to have seen the extension of tourist visa validity from five to 10 years during his tenure .