The immigration pre-clearance in Ireland is only for flights to the USA. There is no pre-clearance facility in Gatwick. As above. You will go through ordinary US immigration control on arrival in the USA.
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There's no TSA PreCheck in Europe (womp womp), but at select Europe airports, travelers can head to the front of the security line, free of charge.
Usually, when you land in the US from a foreign country, you go through a customs inspection in the first US city you land in. However, if you're flying from one of 14 designated airports with preclearance facilities offered by Customs and Border Protection, or CBP, you clear customs before you fly.
Most budget airlines like Frontier, Allegiant, Spirit, and Sun Country all participate in TSA PreCheck. Notable airlines that don't participate in TSA PreCheck include Aer Lingus, China Southern, China Eastern, and EgyptAir.
Food and drinksDrinks are allowed in your hold luggage. You can carry cakes, fruit, vegetables, sandwiches and all solid foods in your hand luggage. The container carrying these foods must not exceed 100ml in size, regardless of the amount inside. Jams, honey and other preserves are also subject to these restrictions.