For the better part of a decade of flying internationally out of DEL, I usually just showed the PDF file on my laptop or phone and used that when flying out of DEL internationally. During this entire period, I was often asked to show a printout of something if flying from IXJ, LEH or SXR to DEL and the PDF method worked far less reliably. In more recent years, DEL has become almost as much of a pain about this as the dangerous dog and pony show involved on going from SXR to DEL during more turbulent years there than now.