The biggest advance in passenger comfort since the jumbo jet touches down in Perth on July 1.
In a major upgrade, Thai Airways will introduce its first 264-seat Boeing 787 on the Bangkok-Perth route, replacing its A330.
The airline is also increasing flights on the route from five to six times a week from March 29 and then daily with the 787.
Thai Airways' introduction of the 787 will be followed by Air New Zealand on October 15 and Scoot in December.
The Thai Airways flight leaves Perth at 9.15am and arrives in Bangkok at 3.15pm.
The 787 is the world's most versatile, economical and comfortable plane.
Key to its performance is its carbon fibre-reinforced polymer composite construction that is lighter and stronger than the usual aluminium and resists corrosion.
The combination of these qualities allows Boeing to increase cabin humidity from 5 per cent to 14 per cent and reduce the pressurisation altitude from 9000ft to 6000ft.
This virtually eliminates de- hydration and mild altitude sickness, which starts about 6500ft.
Fuselage strength also permits windows that are 50 per cent bigger than on comparable planes.
Cabin air quality is also improved by a new filtration system.
Air New Zealand will be the first to run the bigger 787-9s, starting with the Auckland-Perth route.
The Air New Zealand 787s will offer 18 lie-flat business premier beds and a separate 21-seat premium economy cabin in a 2-3-2 configuration, each section with its own toilet.
The plane's two economy cabins will accommodate 263 passengers, including 14 Skycouch rows, which are a set of three seats that convert to beds.
Virgin Australia will code-share on the service and passengers can book it now.
In a major expansion, Scoot will take delivery of 20 787s over the next two years to replace its six 777s.
The first Scoot 787s will arrive in November and by the middle of next year all its 777s will be retired.
Scoot has major expansion plans with its 787s.