Final answer:
The claim that IFR aircraft have no obligation to 'see and avoid' is false. Regardless of flying under IFR, pilots are required to maintain vigilance and 'see and avoid' other aircraft when possible.
Step-by-step explanation:
The statement 'Aircraft flying under IFR have no obligation to exercise vigilance to see and avoid other aircraft' is false. While the Instrument Flight Rules (IFR) allow pilots to fly in weather conditions that are not suitable for visual flight, they do not absolve pilots of the responsibility for collision avoidance. All pilots, regardless of whether they are flying under VFR (Visual Flight Rules) or IFR, must remain vigilant and be prepared to 'see and avoid' other aircraft whenever the situation and regulations permit. The primary tool for IFR aircraft to avoid collisions is Air Traffic Control (ATC) separation; however, this does not negate the responsibility of the pilots to maintain vigilance.