Bermuda Aviation Services traded 6,000 shares on the Bermuda Stock Exchange (BSX) yesterday, closing at $3.50 with no change in share price.Butterfield Preferred traded seven shares to close at $1,230, also with no change in share price.The BSX closed at 1,069.97, trading 6,000 shares worth BD$21,000 and seven US shares worth US$8,683.11.