Not all direct flights are precleared. Any afternoon flights are typically not precleared.
Are you sure about this?
According to Aer Lingus, all flights to the USA are pre-cleared for immigration...
http://www.aerlingus.com/travelinformation/movetoterminal2atdublin/usimmigration/
I actually don't like preclearance. I prefer to save money and fly indirect.
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