Problem with multiple requests to different servers using HTTPService

Hi
I'm aware that we are limited to two concurrent connections to a single host, so I'm looking into using either subdomains pointing to the same server, or separate physical servers to process multiple requests side-by-side.
However, whichever way I try to send three requests, looking at the Network Monitor the 3rd request always waits until one of the first two has finished. In the screenshot below, all three requests were sent at the same time to three separate physical servers, yet the top request didn't start until the bottom request finished, at 15:33:28
Any ideas how to get round this? I'm using SSL, but I've also tested it on HTTP with the same results. I'm writing an AIR app, and posted this on the AIR forum but was told it was a Flex issue and I should post it here.
Please let me know if any more information is needed
Many thanks
James

Would that still apply even though I'm not running this inside a browser, but in AIR?
I've seen this method recommended by other people, and also the following page seems to suggest that what I'm doing should work
http://www.chadupton.com/blog/2008/08/maximum-concurrent-http-requests-from-adobe-air/
Kind regards
James

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