I sent mine in via registered mail ($3.25) well before the deadline and never got anything back.


OK, just got notification yesterday that it was received two days after the deadline and so is "invalid".
First, it is too bad that this issue was posted so close to the deadline that our slow US mail system could not get it there on time.
Second, for future reference, the letter says that you may FAX these types of letters in instead of mailing !!
Someone at S.O.A.R. should have noted that in their info post.
The fax number to use is (202) 267-9328 for the FAA Airspace Regulations and ATC Procedures Group.