Department of the Taoiseach

How much money has the Department spent on air travel between January 2016 and December 2017? Please specify breakdown of spend with specific airlines. Does the Department collect or accumulate air miles/credits from frequent flier programmes on flights booked and paid for by the department or do staff members travelling collect their air miles/credits personally ? How are the benefits of the air miles/credits used by the Department ? Are staff permitted to use accumulated airmiles for personal travel or to purchase items from frequent flier programmes? If staff are permitted to use airmiles for personal travel, does the Department treat this as benefit in kind?