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So in 10-15 years when I want to return, I already think it's unfair that because I chose to expand my horizons and gain different experience, that I should be discriminated against just because Joe Smith has flown the Sydney-Gold Coast route 2 million times.
The seniority system locks out experience and doesn't acknowledge what someone with extensive experience could bring to an airline.
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You just answered your own question.
Relevant experience may be all that really counts. 2 million times is a lot of anything. Seasons for one.