Is there a commonly recognized placeholder airline name? I'm wondering if there is a common placeholder name for an airline, either implying a legally disclosed or fictional entity, which is frequently used? 

For instance, I've seen the terms containing 'widgets' used very often in an economics context. John Doe is often used in legal cases.

*"Placeholder names are words that can refer to objects or people whose names are temporarily forgotten, irrelevant, or unknown in the context in which they are being discussed." -Wikipedia
I think Oceanic Airlines is well known fictive airline. It is used widely in Lost and also Alias, Castle, JAG, Category 6: Day of Destruction and in Executive Decision (the material from this movie was reused in a lot of low budget movies).