Russian birth certificate number (for children under 14 years of age) — a Roman numeral (entered with Latin letters I, V, X, etc.), two Cyrillic letters (e.g., А, И, М, Ю, etc.), and six Arabic numerals. For example: VIIЮК123456.

If the child turns 14 years old by the time of the flight, the ticket must be issued using a passport. Travel with a birth certificate will not be possible.