Don't think it really matters. I've never seen much difference in the price of transatlantic flights up to 2 weeks in advance. Last year booked my flights in May for July and I checked again in July and it was pretty much the same.
More important than when you book is when you fly. June July and August are usually most expensive, May September and October are cheaper. Also cheaper to fly midweek than on weekends.
Unlike domestic travel international prices are basically set by taxes and regulations, it is not really a free market at all and fuel is only a third of the total cost so prices are fairly constant
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