As others have indicated corporate travel policies can vary widely even outside of company size. In the consulting world travel expenses are billed back to the client. In my company is the client bulks at out travel policy (J for anything over 10 hours total flight time) consultants are forced to abide by what the client wants. Surprisingly some of the largest most successful companies are the stingiest. We've had Fortune 500 companies complain about paying for a US resource to fly to Europe in Y.