I have been granted 1-94 validity till dec 29, but i need to sstay in US till March 18th. I will be applying for extension soon. I had booked a return ticket for march 18th. I would like to know if i should reschedule it dec 29th when i will apply for an extension(as documentation of proof of return) or it is better to keep march 18th as before. Please advice. Thank you.