primaryAirlinePartner

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: primaryAirlinePartner

Indicates that one airline serves as the main or preferred partner airline for another entity, such as a traveler, company, or loyalty program.