Hi All, I am on H4 Visa and my husband is on H1B. We are inviting my parents from India to visit us in USA as I am expecting a baby. While filling DS160 it ask for Flight details and stay details. Is it required to book the tickets earlier before even we apply for the Parents Visa. In Stay details I can provide my US address but flights we were thinking we should book once we have parents visa approved. Please suggest what is the best thing to do whether book tickects in advance or later once Visa gets approved.