Simplify the following text for a Grade 6 native English-speaking person.
Original: Airbus thinks that the 787-8 will have a range of 6,720 nmi ( 12,450 km ) which is about 1000 nmi ( 1,900 km ) less than what Boeing said it would be .
Simplified: Airbus believes the first twenty 787-8s will have a 219.5 t maximum takeoff weight and be limited to a 12,450 km ( 6,720 nmi ) range , around 1,900 km ( 1,000 nmi ) less than the figures published by Boeing .