Final answer:
Air traffic control services are routinely offered to IFR pilots and on a workload-permitting basis to VFR pilots.
Step-by-step explanation:
Air traffic control services are routinely offered to IFR (Instrument Flight Rules) pilots and on a workload-permitting basis to VFR (Visual Flight Rules) pilots. IFR pilots receive air traffic control services such as clearance for departure and arrival, guidance on air routes, weather and traffic information, and separation from other aircraft. VFR pilots, on the other hand, may request air traffic control services such as traffic advisories or assistance in emergency situations, but it is not guaranteed that they will receive the same level of support as IFR pilots.