Flights to the stratosphere

Hey now I bring you a review of what are flights into the stratospherethese usually take place in Russia but some are from the United States is really cool flight program shows the curvature of the earth and I mention here are performed some agencies for review and then if some of you realize it or has done it and have as I write to uswas:
I put a really cool video q are shown as these trips ...

• http://www.flymigsokol.com/flights/space_program
• http://www.bestrussiantour.com/jet_flights/edge_space_mig31
• http://www.spaceadventures.com/