American has announced an increase for passengers checking a second bag to and from Europe from $60 to $100. This applies to tickets purchased after 6 June. Those buying before that date pay the old $60 rate.
Exceptions apply for AAdvantage Exec Plat, Plat and Gold who get two free bags. Travellers in First and Business class get three free bags.
Full details are here – UK Web Site
The total dimensions of each checked bag may not exceed 62in / 157cm (length + width + height) for all customers.