Join Date: Oct 2000
Location: Munich, Germany
Programs: LH HON, DL FO/MM, Marriott Lifetime Platinum, Accor Lifetime Platinum, Sixt Diamond
Posts: 6,174
On DL, it is based on time of ticket issuance. If you need to reissue your ticket, then the September 11 security fee is applicable.
Exception: involuntary rerouting, and this includes schedule changes. So Old Gold - if you did not make any voluntary changes, CO should be to absorb the Sep 11 security fee.