actually, this was at the bottom:
For this sale, the following applies:
Available on southwest.com, only.
21-day advance purchase.
Fares are nonrefundable.
Fares shown are each way and do not include federal excise tax of $2.75 for each flight segment (takeoff and landing, see additional information below).
Fares do not include airport-assessed passenger facility charges (PFC) of up to $18 roundtrip.
Travel beginning May 29, 2001 through October 26, 2001.
Purchase beginning May 8, 2001 through May 10, 2001, midnight Pacific Time.
Fares are available one-way or can be combined with other fare types.
Penalty applies to any changes made after purchasing Southwest Anniversary Specials. See below for more details
so this looks like it started TODAY