Flying higher and faster is an excellent way to avoid certain surface to air missile threats, but an SA-10 isn't going to care if you're going mach 1 or 2; it's going to kill you regardless if you fly inside of its engagement envelope (which is well above the 40k you've mentioned). You aren't going to be dodging or outrunning a modern SAM at mach 2. Why would a SAM operator fire at you when you're flying away from the site, when they can just as easily fire at you as you're heading towards them, effectively using your speed against you? Unless you're doing some sort of low altitude ingress (which the F-22 is not), they're going to see you way before you start flying away from them (stealth nonwithstanding).
Shoulder fired missiles are the same way, and most operators will try to shoot you with a head on aspect. Speed may make the envelope you're in smaller, but they will still be able to acquire, track, and fire on you. However, even newer generation shoulder fired missiles have a hard time getting above 20k (see http://en.wikipedia.org/wiki/9K38_Igla).
SAMs are a huge threat on the modern battlefield, and there were several shootdowns in the first Gulf War as well as in the Kosovo conflict. Scott O'Grady's F-16 was shot down by an SA-6 in 1995, and while I doubt his Viper was supersonic at the time, the SA-6 is far from a modern system. (http://en.wikipedia.org/wiki/Scott_O%27Grady)
There are advantages to dropping bombs while going supersonic, but they don't have to do with SAM avoidance.
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Flying higher and faster is an excellent way to avoid certain surface to air missile threats, but an SA-10 isn't going to care if you're going mach 1 or 2; it's going to kill you regardless if you fly inside of its engagement envelope (which is well above the 40k you've mentioned). You aren't going to be dodging or outrunning a modern SAM at mach 2. Why would a SAM operator fire at you when you're flying away from the site, when they can just as easily fire at you as you're heading towards them, effectively using your speed against you? Unless you're doing some sort of low altitude ingress (which the F-22 is not), they're going to see you way before you start flying away from them (stealth nonwithstanding).
Shoulder fired missiles are the same way, and most operators will try to shoot you with a head on aspect. Speed may make the envelope you're in smaller, but they will still be able to acquire, track, and fire on you. However, even newer generation shoulder fired missiles have a hard time getting above 20k (see http://en.wikipedia.org/wiki/9K38_Igla).
SAMs are a huge threat on the modern battlefield, and there were several shootdowns in the first Gulf War as well as in the Kosovo conflict. Scott O'Grady's F-16 was shot down by an SA-6 in 1995, and while I doubt his Viper was supersonic at the time, the SA-6 is far from a modern system. (http://en.wikipedia.org/wiki/Scott_O%27Grady)
There are advantages to dropping bombs while going supersonic, but they don't have to do with SAM avoidance.