The aircrafts transponder had been turned off and it was routed over a hot zone, this was no accident, Iran intended for it to be shot down. BTW that plane cruses at just over 500 mph.
BULLSHIT
The Shoot-Down of Iran Air Flight 655
the US claimed that the “Iranian airliner, in some ways, was not acting like a passenger plane . . . It was heading directly for the ship, appeared to be descending (as though it might be 40 The United States and Iran attacking) and was about four miles outside the usual commercial air corridor” (The Washington Post, July 4, 1988). The Pentagon further asserted that USS Vincennes was in international waters, i.e. outside the territorial waters of Iran, and that the passenger plane was emitting a military electronic code.
Slowly but surely, all the above claims were proved to be false. Vincennes was not in international waters, but in Iran’s territorial waters. The Iranian Airbus was not heading for the ship or even descending but ascending. The plane was not four miles outside of the usual commercial air corridor, but well within it. Moreover, Flight 655 was not emitting any military signals but regular transponder signals, which identified it as a commercial aircraft.
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