Southwest says this;
Q: Can I use a conversion factor when determining flight time accumulated in the military?
A: Yes. Military Conversion: When converting taxi time a conversion factor of .3 or 18 minutes, per leg/sortie should be used. These guidelines are imposed by Southwest Airlines for the purpose of standardizing the calculation of flight time.
FedEx says this;
Q: Can I use a conversion factor when determining flight time accumulated in the military?
A: Yes. You may add a plus (.2) per sortie factor to your flight times. Please note that this conversion factor is applied to each sortie not to total time.
I'm sure there's more than one single seat/tactical pilot that WOULDN'T get through the first page without doing the conversion.