During the pre-flight checks, what must all tray tables be?

Prior to a flight, ensuring that all tray tables are stowed and locked is a crucial safety measure. When tray tables are stowed, they minimize the risk of obstruction during takeoff and landing, which are critical phases of flight. A securely stowed tray table prevents injuries to passengers and crew and also ensures that emergency exits are not blocked by any unsecured items.

Additionally, having tray tables in the locked position contributes to maintaining clear aisles and access to safety equipment, should it be needed. It also ensures a neat cabin environment, reducing potential distractions during these important phases.

In contrast, extended tray tables could pose a hazard if a sudden maneuver or emergency occurs, and checking for passenger belongings is important but not a general requirement that pertains specifically to the tray tables themselves. Painting tray tables in safety colors doesn't directly relate to operational safety during flight phases. Hence, stowing and locking them is the essential practice during pre-flight checks.