I am a second time nursing mother. I nursed my oldest daughter until she was 14 months. I believe a woman has a right to nurse her child whereever needed. However this child was old enough to eat solid food and drink from a cup so nursing wasn't entirely necessary but may have been doing it to ease the child as it makes them more comfortable during flight and just in general. I do question the fact if she was really discreet or not. There is a big difference in just whipping it out and being discreet. I also just flew on a delta flight and nursed my 5 months old next to a stranger. It happened to be a young lady but I wouldn't have had much choice if it would have been a man I would have done the same thing. I know that it does make some people uncomfortable and given the choice if there is a man present I nurse in another room. However I will not nurse in a bathroom or some other disgusting facility. I nurse in clean fitting rooms, in the car etc But I nursed on the airplane going and returning for my trip and had no complaints. I do have to agree that a blanket is uncomfortable to nurse under my baby was sweating just holding her before we landed because it was hot on the plane and it is distracting for her. But I do feel I have to point out this child was old enough to drink regular milk from a cup.
In my opinion the flight attendant was either really uptight or she wasn't discreet, but I can't judge because I wasn't there. The girl I was sitting next to on the plane was reading a magazine and other male passengers were all around me however I doubt they could even tell that I was nursing, if you do it discreetly it just looks like your cradling a sleeping baby to your chest.
And whoever said it was indecent exposure was wrong it is completely legal in the state she was in and shold be everywhere.