Because any sensible duck will refuse to fly under instrument conditions, it is only necessary to hurl your duck out of the plane and follow her to the ground. Most cats do not want to stand up at all, at any time. It may be necessary to get a large fierce dog in the cockpit to keep the cat at attention. Dirty cats will spend all their time washing. You can see this is very unsanitary.
Old cats are best.
Young cats have nine lives, but an old used-up cat with only one life left has just as much to lose an you do and will therefore be more dependable. Beware of cowardly ducks. Ducks are no better on instruments than you are. Be sure the duck has good eyesight. Nearsighted ducks sometimes will go flogging off into the nearest hill.