This is another with a video tutorial at the bottom by Deb Tucker. I love it! I think my favorite yet.
http://janeweston.blogspot.co.uk/201...-tutorial.html

I'm surprised no one brought up this one before now. I haven't made them this way, but I think it is called the one seam method. It has another name also, the name of the man who started it. Someone will know.

After this goose is sewn into your project, you can round back the bias edges and make some really pretty things.

I think Ricky Tims shows this folded method in a video with Alex Anderson.

For the patchpieces method-- if fabric B (sky) is four 2 1/2" squares, then how big do I cut the one square for fabric A (the geese)?

givio, you may have already figured it out by this time, but I just ran across your question. I use the Deb Tucker Wing Clipper method that makes four at a time, and if the four small squares are 2 1/2", the big square will be 4 1/2".

Ricky Tims was taught the one seam flying geese method when he taught in England. It's a very old method. He showed how to do it on The Quilt Show. It's the method I use for small flying geese.