airportCodePair

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: airportCodePair

Indicates a relationship between two entities where each is associated with a specific airport code, typically representing a pair of airports linked in some context such as a route or connection.