"While the IRS will complete open audits, management companies can be secure in the fact that while additional guidance is developed, they will not face potentially crippling tax assessments as a result of those audits." Source: NBAA president and CEO Ed Bolen.
Control surface rigged such that the aileron moving up moves a greater distance than the aileron moving down. The up aileron produces extra parasite drag to compensate for the additional induced drag caused by the down aileron. This balancing of the drag forces helps minimize adverse yaw.