http://911woodybox.blogspot.com/2011/08/cleveland-airport-shell-game-delta-1989.htmlI examined the circumstances of the landing of Delta 1989, a Boeing 767 out of Boston, at Cleveland Hopkins Airport on 9/11. I was lucky to find so much evidence for the existence of a shadowy doppelganger flight of Delta 1989 - landing at about the same time and likewise being evacuated - that I published the results here.
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I claimed, however, and do continue to claim that an unidentified Boeing 767 landed at Cleveland in emergency and was evacuated, with Delta 1989 serving as a cover, i. e. whoever asked for the identity of the mysterious plane afterwards reaped the answer: that was Delta 1989! and stopped asking questions.
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So United 1898 and Delta 1898 were both fake flight numbers. The identity of the numbers and the similar context (United 1898 was an emergency case; Delta 1898 was a confirmed hijacking) leads straightforwardly to the conclusion that these two planes were one and the same. The close similarity of the flight numbers 1898 and 1989 corroborates the thesis that Delta 1989 functioned as a cover-up for Flight 1898. The plane was probably evacuated as United 1898, was quickly renamed Delta 1898, and fell into oblivion due to the informational cover provided by Delta 1989.
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Combined with the information already presented in my original article, there is now ample evidence that Flight 1898 was a Boeing 767 of United Airlines coming from Boston - but it was not the regular United 1898. The number of the United Boeing 767's departing from Boston is so small that it should narrow down the search for the identity of the mysterious plane considerably. United 177 looks like a good candidate.