Well, since I was giving a tale of flight, another update after 2.5 more months.
Pesto now loves to fly. Flies a lot. Her main entertainment is enticing me to get near her so she can fly away. If I'm sitting a the computer working, I get regular (and increasingly lower) fly-by's and she then sits on the cage (a few feet away). If I move toward her she flies to the stand in the same room. If I move toward that just as I'm getting there, she flies to the other end of the house and a stand there. If I follow it keeps going, if I don't, a few minutes later she returns and starts the low pass flight again to get me engaged.
She's clearly not trying to avoid me, but effectively to get me to chase her.
The upside is we both get exercise (after gaining about 20g she's back to her purchase weight, I think not from change in diet but from a lot more exercise).
If I'm cooking she always comes to visit (stand in the kitchen area) but frequently she just spends 30 minutes or so flying back and forth to the other end of the house, with departures and arrivals every couple minutes.
Birds like to fly -- who knew?
The downside is if I actually want to do something with her - bath, lock her up, etc., she can't tell the difference and it becomes a bit of a chase, though I'm learning to get a hand up in front of her probable path and she cooperates. Or there's always food - she will do most anything for walnuts.
I have so far been successful in "approved airport landings only". She gets a cloth or something tossed at her instantly on the rare times she lands elsewhere, and has stopped trying. I'm sure I will regret saying this but weeks have gone by with only landings on stands or cages or outstretched arms.
Now the vet visit last week was interesting. Getting her to stand still for a weight check took MANY tries and then it was maybe 2 seconds. She more or less remembered the "approved landing spots only" and just flew in circles or back to me, though once landed right on the vet's head. But tries to get her to hold still to be touched just resulted in more flying in circles, so she got toweled for the exam, but it went reasonably well.
Vet says I need to train her better. Probably right, but I'm pretty happy she's learning to fly to/from approved places only. Enough so I generally leave her out when I go for groceries, etc.; so far she just picks a spot and takes a nap.