Cleary Gottlieb Steen & Hamilton, Linklaters and Dechert are among a host of firms to have landed roles on an American Express (Amex) joint venture with an investment group led by Certares.

The group of investors will pay $900m (£543m) for a 50% stake in Amex’s Global Business Travel (GBT) division, which will be separated into a dedicated holding structure. American Express will also have a 50% stake.