The Hanjour visas
We have records of three visa applications by Hani Hanjour, but issues have been raised about them.
However, a (Source)|Moussaoui trial document tells us that Hanjour was issued Saudi passport #A66998 on 25th February 1996. This was due to expire on January 1st 2001, and he was issued the new passport #C241922 on 24th July 2000. This fits with the visa applications.
As his passport has changed, it seems likely that the transliteration of his name was altered from Hanjoor to Hanjour at the same time. Is this significant? We've seen the name spelled both ways after the attacks, so probably not, but it would take someone familiar with Saudi passport procedures to provide a definitive answer.
It's a similar question with the handwriting. Perhaps someone else completed one or both of the forms for him? It seems reasonable to believe that might be done for applicants who don't have strong English language skills, but again, confirmation is required.
As for Hanjour's specified heights, two of them are the same (5' 8", and 68 inches). The third is given in metric, as 170 cm. Convert that correctly (divide by 2.54) and you get a height of 66.9 inches, so we're not talking about a significant difference here. I'm actually somewhere between 6' 1" and 6' 2", and I've probably used both heights on different forms over the years. If Hanjour were actually somewhere between 5' 7" and 5' 8", then he might have used 5' 7" in this case, which is 170.18 cm, then rounded down to 170 cm for the form.
And there's another possibility. If you start with a 68" height, but multiply by 2.5 instead of 2.54, then you get... 170 cm, precisely. This could be nothing more than a simple conversion error.