Soulbird LLC, a charter operator based at Oklahoma City Wiley Post Airport, received FAA approval in early March 2026 to conduct Part 135 air carrier operations with aircraft configured for 10 or more passengers, expanding its certification beyond the previous nine-seat limit. The milestone was marked by the addition of a 2017-built Cessna Citation Sovereign+ (N471CB) configured in a 12-seat layout, bringing Soulbird's fleet to six aircraft. The approval dates — March 4 per Soulbird's own announcement and March 11 per ch-aviation's reporting — reflect the completion of a multi-stage FAA process that includes Operations Specifications amendments, audits, proving runs, and Safety Management System compliance reviews. The net effect is that Soulbird now holds full Part 135 carrier authority across a wider segment of the business jet market.
The regulatory distinction between sub-10 and 10-or-more passenger Part 135 operations is operationally and commercially significant. Below the threshold, operators work within a comparatively streamlined regulatory envelope — pilots, maintenance, and dispatch obligations are still substantial but calibrated to smaller aircraft and shorter missions. At 10 or more seats, the FAA applies a stricter standards package: enhanced Crew Resource Management training requirements, additional Operations Specifications language, and aircraft that must carry the appropriate type certificate seating authority. The Citation Sovereign+, with an FAA type certificate supporting up to 12 seats, satisfies that last requirement cleanly. For working Part 135 pilots, a carrier crossing this threshold signals expanded duty obligations and potentially broader training currency requirements, particularly if crew members transition between aircraft configurations within the same certificate.
The business rationale for Soulbird's upgrade centers on the group charter segment, where demand for midsize-to-large cabin jets capable of carrying 10 to 12 passengers has grown steadily as corporate travel programs consolidate trips and reduce per-seat costs. Soulbird's aircraft management model — which blends Part 91 owner operations with revenue-generating Part 135 charter — stands to benefit directly from the Sovereign+'s larger cabin. Operators structured this way routinely cite revenue offset figures in the range of $1,000 to $1,500 per flight hour when the aircraft is placed on a Part 135 certificate and actively chartered, reducing net ownership costs for the aircraft's principal operator while expanding utilization.
The approval reflects a broader pattern in the business aviation charter market, where regional and mid-tier operators are upgrading their certificates to capture group and incentive travel business that previously defaulted to fractional programs or large-fleet charter houses. Northern Jet's SpeedBird subsidiary pursued similar 10-or-more certification in late 2023 with a Bombardier Challenger 605, and the cadence of such approvals has continued into 2025 and 2026. For corporate flight departments and Part 91 operators evaluating aircraft management partnerships, Soulbird's expanded certification represents a more capable placement option — one that accommodates full-cabin configurations on larger midsize jets without requiring the aircraft owner to downgrade seating or operate under restrictive OpSpecs that limit group lift. The trend underscores how the regulatory framework around Part 135 certification is increasingly being used as a competitive lever, not merely a compliance baseline.