Flew with them internationally a week back and there is literally no change. *A FF of another airline cannot be added on booking and now (for a few years) even during web check-in but had no issues getting it added at the airport at the check-in counter. Their check-in still takes an age to complete and they are still as inefficient. They still give a hand written lounge card and their staff on the ground is still as friendly and intend to be as helpful as they were (this isn't sarcasm, I truly mean it).

Once on board the flight (a B788), the AC was not functioning while on the ground and took more than 45 minutes after take off to cool the cabin. So same old, same old.

Did not have the onboard meal as it was a short flight so can't comment on the meal but I have had some really good food on AI as well in the past.. Their J domestic meal on the DEL-BOM sector in the 9 PM flight that goes from DEL-BOM-EWR as well as their J domestic meal on the 7.45 PM BOM-DEL flight that flies onward to HKG (I guess) have been some of the better meals that I have had in the air purely taste wise..

Overall I could not notice any change at all after the Tata takeover..