Convert the following Grand Travel Airline entity-relationship diagram into a relational database. 
Definitions:
Perception
The process by which sensory information is interpreted and organized in the brain to understand and interact with the environment.
Depolarize
The process by which a cell, such as a neuron, decreases its electrical charge, often making it more likely to produce an electrical signal.
Sodium Ions
Positively charged particles (Na+) formed when sodium atoms lose an electron, crucial for various physiological processes including nerve impulse transmission and muscle contraction.
Neuron
A unique cell responsible for conveying nerve signals; known as a neuron.
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