A day ago, one of my best friends was supposed to embark on his air journey from India to Qatar... With an ECR stamp in his passport, he was prohibited to board the aircraft on the basis of Qatar ON ARRIVAL visa... Although I have heard that they exempt senior citizens and emergency cases from this rule... However, I would still highly recommend getting a Qatar tourist visa prior to your journey as long as you have ECR... Normal people wouldn’t be allowed to board any aircraft bound for Qatar if they possess a passport with an ECR stamp...