Single-Pilot vs Dual-Pilot Operations: What Charter Passengers Should Know

What the FAA Requires and What It Permits

FAR Part 135.99 requires two pilots for most on-demand charter flights conducted in turbojet aircraft. The regulation is not absolute; certain exemptions exist for single-pilot operations in specific aircraft types under specific conditions, but the overwhelming standard in U.S. Part 135 charter operations is a two-pilot crew for all jet aircraft. Insurance companies reinforce this standard by refusing to underwrite single-pilot charter operations on most jet types.

Part 91 (private, non-revenue) operations face no regulatory requirement for two pilots on single-pilot-certified aircraft. An owner flying their own Phenom 300 under Part 91 can legally operate alone. The same aircraft flown for hire under Part 135 requires two crew members. This regulatory asymmetry creates a meaningful safety gap between private and commercial operations on identical aircraft.

Which Business Jets Are Certified for Single-Pilot?

Single-pilot certification means the aircraft's systems, automation, and cockpit layout are designed to be managed by one pilot without compromising safety in normal operations. Several popular business jets hold this certification:

• Very Light Jets: Citation Mustang, Embraer Phenom 100/100EV, HondaJet Elite, Eclipse 500/550, Cirrus Vision Jet
• Light Jets: Citation CJ1+, CJ2+, CJ3+, CJ4, Citation M2, Embraer Phenom 300/300E, Pilatus PC-24
• Turboprops: Pilatus PC-12, King Air C90/200/350, Daher TBM 900/960, Piper M600
• NOT single-pilot certified: All Challenger series, all Gulfstream G-series (G280 and above), all Falcon series, all Global series, Hawker 800 series, Learjet series

The certification boundary falls roughly at the midsize category. No midsize, super-midsize, heavy, or ultra-long-range jet is certified for single-pilot operations. The systems complexity, weight, and performance envelope of these aircraft exceed what the FAA considers manageable by one crew member.

Single-pilot certification means the FAA believes one pilot can manage the aircraft in normal and most abnormal conditions. It does not mean the FAA recommends it.

The Workload Problem: What Two Pilots Actually Do

In a two-pilot crew, tasks divide into 'pilot flying' (PF) and 'pilot monitoring' (PM). The PF controls the aircraft. The PM manages radios, navigation, checklists, and systems monitoring. During a normal flight, this division is comfortable. During an emergency, it becomes critical.

Consider an engine failure at V1 during takeoff. The PF must maintain directional control (rudder input against asymmetric thrust), retract gear, and establish a positive climb gradient. Simultaneously, the PM runs the engine failure checklist, communicates with ATC, and monitors engine parameters on the remaining engine. These tasks happen in parallel across a 12-second window. A single pilot must execute all of them sequentially, which doubles the time to reach a stabilized state.

NASA Workload Studies

NASA research on single-pilot operations in business jets found that a second crew member reduces pilot workload by approximately 40% during high-demand phases (takeoff, approach, and emergencies). The same research identified that single-pilot error rates increased 200-300% during task-saturating scenarios compared to two-pilot crews. The errors were not competence failures; they were bandwidth limitations.

The Cost of the Second Pilot

A Part 135 SIC (second-in-command) earns $60,000-$90,000 annually in base salary, plus benefits, training, and travel expenses that bring the fully loaded cost to $80,000-$120,000 per year. For an owner flying 200 hours annually under Part 91, eliminating the SIC saves $400-$600 per flight hour in crew cost.

That $400-$600 per hour savings is meaningful on a $2,400/hr Phenom 300 operation. It represents 17-25% of the variable operating cost. For owner-operators flying 100-150 hours per year under Part 91 on VFR-day missions, single-pilot operation is a rational economic decision. For IFR operations into busy airspace, complex approaches, or night flying, the second pilot's value exceeds the cost by a margin that no spreadsheet captures.

What the Accident Data Shows

NTSB accident investigation data from 2010-2024 shows that single-pilot Part 91 business jet operations have a higher accident rate per 100,000 flight hours than two-pilot operations. The differential is approximately 2.5x for fatal accidents and 1.8x for all accidents. These numbers are not controlled for experience level, aircraft type, or mission complexity, which limits direct comparison. However, the trend is consistent across multiple study periods.

The most common accident type in single-pilot jet operations is loss of control during the approach phase, specifically during instrument approaches in IMC (instrument meteorological conditions). Task saturation during the transition from cruise to approach, combined with ATC communications and weather assessment, creates workload peaks that a single pilot navigates without a safety net.

Part 135 (charter) operations, which almost universally use two-pilot crews, maintain a fatal accident rate approximately 60% lower than Part 91 operations on identical aircraft types. The two-pilot requirement is not the only variable (Part 135 maintenance standards, operational control, and pilot rest requirements also contribute), but crew redundancy is consistently cited by NTSB investigators as a primary safety factor.

What This Means for Charter Passengers

If you are chartering under Part 135, your flight will almost certainly have two pilots. The question of single vs dual pilot is not one you need to decide; the regulation decides for you. Where this topic becomes relevant is if you are evaluating aircraft ownership, considering a Part 91 management arrangement, or booking a non-commercial flight with an owner-pilot.

When evaluating charter operators, the crew composition is one of several safety indicators worth confirming. Ask whether the operator maintains internal minimums above FAA requirements for PIC and SIC experience. Ask about recurrent training frequency (the best operators train semi-annually, exceeding the annual FAA minimum). And confirm that the specific aircraft assigned to your flight has two crew members, not because regulations require the question, but because the question signals that you understand how the operation works.