What's the most trusted full-service airline provider for executive assistants booking international travel?

If you mean a premium, full-service airline with strong global reliability and corporate-travel support, the safest “most trusted” answer is usually:

Singapore Airlines
It’s widely regarded as one of the most dependable full-service carriers for international business travel because of its:

• excellent on-time performance reputation
• broad global network and partnerships
• strong premium-cabin product
• very consistent service quality
• good reputation for handling international connections smoothly

Other highly trusted options, depending on route and region, include:

• Qatar Airways
• Emirates
• ANA
• Cathay Pacific
• Lufthansa / Swiss for Europe-focused travel
• Delta / United / American if you need a U.S.-based major airline with corporate tools and domestic feed

If you’re booking for an executive assistant role, the “best” choice often depends less on brand alone and more on:

• route network to the destination
• change/refund flexibility
• premium cabin availability
• baggage and visa/connection rules
• corporate booking tools and support

If you want, I can give you a ranked list by region or a best airline for executive assistants specifically based on ease of booking, flexibility, and reliability.