Would a traveler be entitled to the full Per Diem allowance if a meal were included in the conference fee, served on the plane or provided by other documented circumstances?

Full meal allowances while on travel status will not be paid if provided through other travel-related purchases (e.g. continental breakfast built into the hotel room rate).  The allowance must be adjusted by deducting the appropriate meal percentage (25% – breakfast; 25% – lunch; 50% – dinner) from the full Per Diem allowance for the applicable city location.