Combining frequent flyer miles

Combining frequent flyer miles

Is there any way to combine frequent flyer miles from unrelated programs? I've got a few thousand with American, a few thousand with United, etc. I'd like a way to pool them all together. Does anything like that exist?
Finished Product…for now. :)

Finished Product…for now. :)

Fun with Weeding

Fun with Weeding

Plant ID

Plant ID

My room

My room

Fresh Flowers

Fresh Flowers

Decisions, decisions

Decisions, decisions