Filling in your name on a flight ticket requires "high-fidelity" accuracy to match your official government-issued ID or passport exactly. The most critical rule is that the "First Name" and "Last Name" must match the spelling on your travel document perfectly. Middle names are often a source of confusion; while many airlines combine the first and middle names into one string on the boarding pass (e.g., "Johnmark Smith" for John Mark Smith), this is normal and not a reason for concern. However, if your passport includes a middle name, you should include it in the "Middle Name" or "First Name" field during booking to be safe. Avoid using nicknames (e.g., "Bob" instead of "Robert") or suffixes like "Jr." or "III" unless they are part of the machine-readable zone of your passport. If you have a hyphenated name or multiple last names, enter them exactly as they appear. In 2026, an error as small as a transposed letter can lead to being denied boarding or having to pay a significant "name change fee," so always double-check your entry before clicking "confirm."