Emirates, the biggest Arab airline, seeks a guarantee that The Boeing Co. will build a larger version of the 787 Dreamliner before the carrier chooses planes to replace older aircraft and add routes.

Emirates continues to push Boeing to commit to the 787-10, a double-stretched version of the 787-8. "We'd like an absolute guarantee that they will make that aircraft by a certain date," Flanagan said ...

The aircraft is becoming the backbone of many airlines' fleets.