I snagged this post from Tom in an unrelated thread that I found very interesting. Last week I visited the BOS FSDO (most of my area) and spoke with the UAS guy. He was uncharacteristically friendly and interested in hearing from 333 guys periodically. He was somewhat aware that local towers and operators can no longer ink letters of understanding for addendum's to the blanket COA that we use. MOST of us are impacted by this situation. I really appreciate Tom's post and I hope he and any others using COA's will chime in here and offer suggestions about approach and wording with these requests, as well as experience with turn around times and denial/approval rates.