The 'A' key in FSX is a new feature [cameradefinition.x], not available in FS9.
If an FS9 aircraft has the cabin modeled then you should be able to move around using the following methods:
*The FS9 'move Eyepoint' key combinations while in the VC (check Control>Assignments or the Kneeboard for the key combinations)
*Flight1's F1View utility-free-the module allows eyepoint movement using the mouse.
*Anticyclone's Active Camera-payware with more options than either of the above plus saving custom views-demo available.
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Matthias Neusinger's FS Recorder module-free-flight video recorder plus allows saving custom Tower, Spot and VC views which gives you something like the FSX 'A' key function.