First, generally employees earn FF miles - companies get rebates/discounts (exceptions exist and rebates tend to be for larger customers).

For fare classes, you need to look at the fare you are flying on a particular carrier and how that maps over to your FF program. For *A members, they should have a pretty comprehensive list by carrier of which fares earn miles, whether they get bonus miles (class of service) and how much, partial miles, or no miles at all. So look to your "home" program's website to see this list.