SINGAPORE (Reuters) – Qantas Airways Ltd, which hopes to buy planes this year for record-breaking 21-hour flights between Sydney and London has two hurdles left to overcome: getting pilots and Australia’s aviation regulator to agree to unprecedented duty times.

FILE PHOTO: Two Qantas Airways Airbus A330 aircraft can be seen on the tarmac near the domestic terminal at Sydney Airport in Australia, November 30, 2017. REUTERS/David Gray

Airlines around the world are planning longer flights to compete with one-stop rivals and collect a fare premium of about 20 percent on non-stop routes, which are especially popular with corporate travelers.

Airbus SE and Boeing Co say their aircraft are ready, with only details like seat configuration left to hammer out, Qantas chief executive Alan Joyce said.

But