Most virtual airlines begin at major hubs.
Atlanta. Dallas. Chicago. Los Angeles.
We chose a different path.
Confluence Air is based at Spirit of St. Louis Airport (KSUS), one of the most distinctive airports in the United States.
Named after Charles Lindbergh's historic aircraft, Spirit of St. Louis combines aviation heritage with modern capability.
KSUS is more than a reliever airport. It is part of the story of aviation in St. Louis. From the legacy of the Spirit of St. Louis itself to the flight schools, maintenance facilities, corporate operators, and aviation businesses that call the airport home today, KSUS remains one of the most active and respected aviation communities in the Midwest.
Located in Chesterfield, Missouri, KSUS serves as a major business aviation airport for the St. Louis region and offers nearly everything a regional airline needs:
Most importantly, KSUS represents opportunity.
Confluence Air was founded on a simple question:
“What if a regional airline started here?”
The answer became a network built around connection.
From Spirit of St. Louis, our pilots connect communities throughout the Midwest and beyond using the CRJ family and ATR 72. We serve major hubs, regional destinations, and seasonal routes while maintaining the flexibility and personality of a true regional carrier.
Our name comes from the confluence of the Mississippi and Missouri Rivers just north of St. Louis.
Our mission follows the same idea.
Where the rivers meet, routes begin.
Welcome to Confluence Air.
Confluence Air is a virtual airline and is not affiliated with Spirit of St. Louis Airport, the City of Chesterfield, St. Louis County, United Airlines, or any real-world airline.
New to Spirit of St. Louis? Here's what you're flying into. It's a real, towered field with full instrument procedures — not a quiet strip.
Field elevation (MSL)
Longest 7,486 ft, ILS-equipped
Spirit Tower, 0600–2300 local
Customs landing-rights airport
7,486 × 150 ft · grooved concrete. ILS to both ends with MALSR approach lighting and high-intensity edge lights. The primary runway — it handles the full CRJ family at realistic regional weights.
5,000 × 75 ft · asphalt. RNAV (GPS) approaches, medium-intensity lighting. The shorter parallel — well suited to the ATR 72-600 and lighter operations.
Approach and departure are handled by St. Louis; the field sits under Kansas City Center. Arrivals come in on RNAV STARs (BUUDD, DELMA), with ILS or RNAV (GPS) approaches published to every runway end. The St. Louis VORTAC (STL, 117.40) is the local anchor. Outside tower hours (2300–0600 local) the field is non-towered — announce on CTAF.
Field data current as of the May 2026 chart cycle. Always brief current charts before you fly.
