1335. Right of way rules in flight.

When two aircraft1 are converging at approximately the same level, the aircraft that has the other on its right must give way, except as follows: power-driven heavier-than-air aircraft must give way to airships, sailplanes2 and balloons; airships must give way to sailplanes and balloons; sailplanes must give way to balloons; and power-driven aircraft must give way to aircraft which are seen to be towing other aircraft or objects3.

Where two aircraft are approaching head on or approximately so and there is danger of collision, each must alter its course to the right4.

An aircraft being overtaken