I'll post some videos of this process in case anyone else is looking at this topic and wants to see how refledge training (or initial flight training) works.
If you're just doing this very casually, sure you can use chair backs or whatever. However, if you're serious about getting the parrot flying or you want to teach indoor flight recall, I really really recommend training perches (or other self standing perches). I'm not even doing this just to market my own product. The whole reason I came up with these in the first place was to solve this same flight problem with Kili.
Here are a few reasons I don't think chair backs are particularly good for this:
-Some are round or polished which can make them difficult or slippery to land on
-Parrot might start chewing them which could be a problem
-Parrot is likely to poop on the part you sit on
-The parrot becomes accustomed to landing on them and will land on them all the time
-Parrots usually poop on the place they land so if you really want to stick to using chairs, I suggest finding some at a junk sale or that you don't need.
The beautiful thing about doing the initial flight training on special parrot training perches is that the parrot becomes very accustomed to landing on them. They are unique to the parrot and become the parrot's place. It knows them as a safe place and will gravitate toward them under panic or distress. Since they look like nothing else in your home, you won't be inadvertently teaching your parrot to land on your own stuff. Seriously, this is what my parrots spend the majority of their time on when they are out of the cage (ok, Truman is bad and still flys up into my blinds but he is getting better to staying on the perches). I bought climbing trees for each bird that cost more than my training perches and yet the birds insist on spending all their time on the training perches anyway.
If I have guests over and Kili gets scared or just about any situation when Kili needs a "place to go" she tends to fly to one of her training perches. She knows where they are situated and she feels safe on them. It's much better for your parrot's hangouts and safeplaces to be parrot specific stuff and not like on top of your cupboards, on your kitchen table, etc. By having these parrot only places and doing a lot of training on them, my parrots have become accustomed to them as their place. I gotta tell you it works out great. Did I mention that 95%+ of Kili's out of cage pooping ends up on a newspaper under her training perch?
Even if you find the stands I make too expensive (or unavailable where you live), I still recommend following the concept in having a parrot specific set of perches for doing all training so the parrot doesn't get too used to hogging your own chairs or places for perching. You really don't want to encourage parrots to land on your stuff because where flighted parrots go, little butt nuggets follow.