[Code of Federal Regulations] [Title 14, Volume 2] [Revised as of January 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR93.224] [Page 274] TITLE 14--AERONAUTICSAND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 93--SPECIAL AIR TRAFFIC RULES AND AIRPORT TRAFFIC PATTERNS--Table of Contents Subpart S--Allocation of Commuter and Air Carrier IFR Operations at High Density Traffic Airports Sec. 93.224 Return of slots. (a) Whenever a slot is required to be returned under this subpart, the holder must notify the office specified in Sec. 93.221(a)(1) in writing of the date after which the slot will not be used. (b) Slots may be voluntarily returned for use by other operators by notifying the office specified in Sec. 93.221(a)(1) in writing.