I work for a Fortune 50 company, and the policy is:
Under 5 hrs flight time = Econ
Over 5 hrs flight time = Bus
Over 10 hrs flight time = First
The policy is not stated to differentiate between employee levels. My guess is that senior management fly the company jets.
Luckily for me I am based on LAX and most travel is to Europe or NYC. So Europe is in F and NYC is in J.