A jet flight out of Kenya either to Hawaii or Washington state in the time frame given is possible. It is also possible Obama had a different birth date than the one given/recorded by Hawaii records. There are too many dots to be connected for me to dismiss a Kenyan birth by Obama.
I put little stock in the possibility of a Kenyan birth. Here is an Article from American Thinker which convinced me that it is extremely unlikely.
If other information comes forward which supports the theory, I will of course re-evaluate. I put no stock whatsoever in what people TELL me the Kenyan Grandmother says. I also put no stock in any document purported to have come from Kenya. As far as i'm concerned, they have the evidential value of a Nigerian scam letter.