Contrary to the previous post which is clearly a personal opinion, most people are not against the visit as several polls have indicated. Just the usual hotheads, diehards and the occasional anti monarchist. But it's still a free country despite their best efforts to end that
I too was puzzled as to why a 32 Squadron aircraft wasn't used. Again contrary to the above post, British military aircraft routinely visit Baldonnel. Indeed the RAF are frequent visitors to airshows. It's can hardly be considered some kind of offence for an RAF aircraft to turn up carrying the Monarch.
Whatever the reason, it's not that.