"Hots" is fairly good and "Brights" is OK but a lighter paper.
Weight is the next important property for airplane flight.
The only problem is that cost of making good paper airplane stock is more expensive than just making bright colored paper.
The main characteristic that suffers in today's market is stiffness (not from too little but from too much).
Things get a little more confusing when it comes to paper or poster board to make glue up style gliders.
These airplanes are a lot of fun but the weight can throw in some variables.
What we are going to concentrate on here is what our best choices are for success in both building and flying paper airplanes.
Over the years I have noticed that if I find a paper that make good airplanes it does not seem to stay on the market for very long.
All of these properties have an effect on the actual folding of the paper, but, when it comes to flying paper planes the three most important are: stiffness, weight, and texture.
You can refer to the PDF file for more detail on why these properties are so different for different brands of paper.