Here's a fascinating video filmed using GoPro miniature video cameras mounted in special housings aboard Mikoyan MiG-31 interceptors of the Russian Air Force. You can see details of how it was done at this LiveJournal page. I highly recommend watching the video in full-screen mode.
The MiG-31 is getting long in the tooth (it entered service in 1981), but it's been upgraded recently and is expected to continue in service until 2028, with a successor aircraft entering service before then. This may be the Sukhoi PAK FA, or a new MiG design allegedly designated the MiG-41.