CLEAN : Relatives of plane crash victims arrive at Barcelona Airport

The video discusses the inspection process for planes, highlighting that inspections occur upon landing and after certain hours of operation. It explains the different classes of inspections, such as Class A and Class B, and emphasizes the importance of adhering to safety rules to ensure a plane's eligibility to fly, regardless of its age.

What classes are mentioned in relation to inspections?

What is mentioned about the duration of the plane's service?