I believe that this flute (or a very similar Haynes) was at Fluteworld on sale for a long time. The low Bb is fingered by the normal Low B plus adding a second LH pinkey key located beyond the usual G#.

I've never seen anything like that! That's really cool.

I have not seen a lot of music with a low B in it, let alone a B flat. I did see the one on flute world a while ago. it seems a bit unconventional for me. But the extra length might change stuff with your sound.... I want to try one...hahah.

Apparantly Balakirev 1 and Mahler 5 have examples of Bb. The source (Norman Del Mar) gave no examples of A so there you go.

low bfalt is rare.. they do make an A footjoint but that is even more rare.... there is even an Eb footjoint which is absolutely tiny... amazing how many variations.

here is a video of a flute with an a foot. Its in japanese but you can still see it

http://www.youtube.com/watch?v=BY-Du6KvCdE&feature=related

its pretty neat