Mumbai to Delhi. Yet again very disappointed. Again a dirty plane, dirty roof, vents, table, entertainment control and window surround. And although I had put my seat selection in my reservation I was put further down the plane in a middle seat. The reason for choosing seat 19D in my booking was to sit beside my colleague. We were both moved. Why bother asking us to select seats if you’re going to stick us anywhere you like, even as a Star Alliance frequent flyer program. I flew with Air India in 2015 from the London to Mumbai and have chosen to avoid that on my last 5 visits with the exception of a couple of domestic flights and Air India have not failed to disappoint. Not good enough Air India. I’m a frequent flyer, taking long haul flights about 30 times a year plus domestic connections and Air India is really low grade.