Which type of identification is NOT accepted at Ryanair check-in?

When checking in with Ryanair, it is essential to provide valid identification that meets specific security and boarding requirements. A birth certificate is not considered an acceptable form of identification for air travel. In the context of Ryanair's policies, valid identification must typically include government-issued photo identification that clearly establishes the identity of the passenger and their right to board the aircraft.

Items such as a passport or a driver's license serve as adequate forms of ID because they are issued by recognized authorities and contain a photograph, which helps in verifying the individual's identity. Government-issued photo IDs also provide additional pertinent information, such as the date of birth and other identifiers that assist in the boarding process. By contrast, a birth certificate lacks a photograph and does not typically fulfill the stringent requirements of identification verification for air travel, leading to its disqualification as an accepted form of ID.