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If you have no control with who you will be flying with, you have no scheming to do. Your only plan should be to join the loyalty program of whatever airline your company uses. cross your fingers and hope it's not Ryan Air. Make sure your frequent flyer number is attached to all your reservations.
Whatever air program you join, if your company gives you enough trips you will earn miles for free flights and maybe status. Make sure to join a hotel loyalty program too, once again whatever hotel group your company uses.