2025 U.S.-Booked Air Volume: $67M
Primary Global Online Booking Tool: SAP Concur
Primary Global Payment Supplier: American Express
Primary Expense Supplier: Workday
Global Travel Risk Management Supplier(s): Everbridge
Consolidated U.S. TMC: Amex GBT
Professional services firm Aon focused on tech stack modernization in 2025 as part of a continuous process of reimagining its travel program ecosystem. The travel team enabled AI-supported channels and expanded its use of NDC content. The focus remains on enhancing user experience and program controls while driving innovation and transparency.
There was steady growth in Aon’s U.S-booked air volume in 2025, up to $67 million from $64 million the year before. The firm operates a global travel policy, implemented in 2019.
In August 2026, Aon agreed to acquire insurance broker USI from private equity owners in a transaction valued at $17 billion. USI is the United States' 10th-largest brokerage, employing 10,500 personnel across 200 branches. The acquisition follows the $13 billion purchase of property and casualty broker NFP in 2024.
Aon has clients in more than 120 countries. Organic revenue grew 9 percent year over year to $17.2 billion in 2025, and is forecast to achieve mid-single-digit or greater growth in 2026.