WHEW....I called to cancel my one-way but keep my wife's itinerary booked at same time. I checked immediately before calling that flight was still available for re-booking so I am on the same flight as her. It's STL-SJC-SEA.

After cancellation I immediately log in to book again with travel funds....it's not there. It's not there. In fact the whole page of STL-SEA with connections is only 2/3 as long as it was. There's a similar timed STL-DEN-SEA but more expensive.

Last gasp -- I closed the browser, opened again, re-logged-in. STL-SJC-SEA is there, and at the price I thought it would be. WHEW. Bought.

I must say, SWA's cancellation email and travel funds availability were instantaneous. Same when I did my other flight, canceling online rather than through the agent. Their systems are working well today.