Only if you are traveling to imphal, you are required to carry a protected area permit, issued By the home department of Manipur after getting the approval from ministry of home, govt. Of India. The permit also specifies the passport number and duration of stay in the stated city. As per the govt. Of India directive, IndiGo is entitled to deny boarding rights to any foreign national in the absence of a valid protected area permit and the entire amount would be forfeited. Foreign national travelling to any sector other than imphal would require to present passport as the only valid photo identification proof.