Yes, in 2026, you can generally travel if your middle name is on your ID but missing from your ticket, provided your first and last names match exactly. The TSA and most international aviation authorities focus on the "Secure Flight" data, which is the backend information you provide during booking (full name, DOB, and gender), rather than the printed name on the boarding pass. Many airline systems actually "scrub" middle names or merge them with the first name (e.g., "JohnDavid") to save space. However, it is a best practice to include it if the booking field allows it, as it helps prevent "False Positives" on "No Fly" lists if you have a common name. The only time this causes a significant issue is if you use a nickname (e.g., "Bill" instead of "William") or if your passport has a middle name and your ticket has a completely different name. For 2026 international travel, as long as your "First" and "Last" are correct, a missing middle name on the ticket will not result in a denial of boarding.