OK, I posted what a great service UPS Stores offered (though it varies by the store) in terms of holding a box for you vs checking it on the plane. I shipped today. Here are my thoughts.
What I shipped:
1 28"x18"x18' box. Weight, about 55 pounds. Cost to ship? $76 plus anothe $30 for $1500 in insurance. The box (with fly rods, bag, tent, boots, stove, flys etc.) is worth about $4000, but the insurance got stupid after $1500.Its kind of scary to realize how pricy your toys are, but thats what happens when you accumulate them over 20 years and then have to figure replacement costs.
On the other hand. Cost to check a second bag on Delta? $50 plus the overweight and over sized baggage fee of $165. Thats $165 per weight plus $165 for size.Advantage UPS. (all numbers are one way)
Still, I will pay $100 to ship this stuff each way. With a first class ticket you get three bags at 70 pounds free.

Lesson learned: If you have to fly steerage, UPS saves money. If you have the FF miles or the cash to upgrade to business or first class, check your gear and pray.
FQ13