Minimum fleet guarantees mean absolutely nothing. You need a minimum block hour guarantee.

Comair had a minimum fleet guarantee, which Delta adhered to, however those planes sat idle in remote parking for the duration of the LOA. We also had the "except for those airframes scheduled to come off lease'' clause.Once the LOA expired, those planes began to disappear pronto. In doing so, Delta intentionally and artificially inflated Comair's costs so they could hasten its dismantling.

A MINIMUM FLEET GUARANTEE IS MEANINGLESS!!! I cannot stress this enough.