Paramveer,
I failed to reproduce the error you described. On my computer, everything works fine (I have Internet Explorer 8).
So, currently, it's difficult for me to say why the error happens.
I wonder why you are using FindAll. As far as I can see, you know the needed element, so if possible, I'd suggest that you address it like Page(...).Panel(..).Panel(..).TextNode(0).
Also, if possible, you can ask developers to assign an id or name to the element displaying the flight id so that you can address this element by this id or name in tests. That will guarantee faster and fault-free work.
