As per the guidelines, it is mandatory to carry a Government issued photo identification (ID) proof along with the E-Ticket for domestic flights in India. The same is verified by the airport security as well as the airline at the check in counter. The valid photo identification documents allowed are: Valid Passport / Driving License / Election Voter Card / Ration Card/ Aadhar Card/ PAN Card/ Photo Identity cards issued by Government On presenting your photo ID proof and E-Ticket copy, your boarding pass will be issued. You need to present the original copy of the ID proof.
Also, as per Air India Support, a photocopy of the ID will not work. Because at the airport they accept only the original proof of identity, they will not accept any photocopy of the proof of identity. To avoid any inconvenience at the airport, please ask your friend to carry an affidavit which will be accepted. In addition to this, you can carry an Affidavit from a Notary Public (preferably with your photo over the Affidavit) stating your name and address etc. which will work as your identity document.
User: Can he still travel with the valid photocopy of the ID proof?
User: he has photo copy of passport and soft copy of his Adhaar card
Air India Support: I'd like to inform you at airport they accept only original identity proof they will not accept any photo copy of your Identity proof so avoid any inconvenience at airport please ask your friend to carry an affadavit which will be accepted.
User: ok
User: Affadavit from Notary public?
Air India Support: Yes it is correct.
User: and do I need to have photo also over Affadavit?
Air India Support: I am sorry for it that information will be provided by them only but in general information it will be require then only it will be acceptable as Identity for any specific person.
This Affidavit you can easily get from Notary officials sitting near the court area, or any office which you know and you can tell them that you need it for this purpose. You may need to show them your Passport copy and Adhaar card copy (preferably color printed) to prove your identity. They may charge you some fee for this document.
On the top of all, if you have 1-2 days for your travel then you must get your documents courier to you by 1-day shipping facility like FedEx, DTDC or FirstFlight etc. This will solve all your issues and you don't have to waste your time at the airport for such things.
Note: Photo Credit Card are also not accepted as Identity proof (this was mentioned on one of the sites that you can use that, but as per Air India support it is not accepted as ID proof).