I read the title (Upgrades after the 7 levels on the priority chart) and thought:
- First Level: Limbo - Standby/No assigned seat.
- Second Level: Lust - Oh they got upgraded, me too.
- Third Level: Gluttony - Take the upgrade regardless of others traveling
- Fourth Level: Greed - I need that upgrade.
- Fifth Level: Anger - Damn they got upgraded.
- Sixth Level: Heresy - No one needs an upgrade.
- Seventh Level: Violence - Trip them as the board, then in the confusion take their seat.
- Eighth Level: Fraud - Use your last boarding pass.
- Ninth Level: Treachery - Change the seat numbers.