The product, however, will differ in key ways from American's domestic and short-haul international basic economy product, which it introduced last year.
Like the domestic product, American's transatlantic basic economy fliers will get the lowest available airfare at the time of booking. In exchange, they'll be last to board and won't be eligible for upgrades.
They'll also pay a fee for their first checked bag, something the airline does not require of customers flying in regular economy on transatlantic routes. American has yet to disclose the fee amount; Delta charges basic economy customers $60 for the first checked bag on transatlantic flights.
In other respects, American will make things easier for transatlantic basic economy customers compared with customers using the low-end fare class domestically. The transatlantic passengers will be able to board with a full-sized carry-on bag for free, plus a bag that fits under the seat. They'll be allowed to make ticket changes for a fee.
In addition, they'll have the option of purchasing an assigned seat in advance for an upcharge, rather than having to wait for a seat assignment at check-in. No advance seat assignments will be available as part of the ticket price, however.