Try this in WITP or AE

[m10bob]

Australian use (of the B 24) :In June 1944, Qantas Empire Airways began service with the first of two converted Liberators on the Perth to Colombo route to augment Consolidated PBY Catalinas that had been used since May 1943. This route across the Indian Ocean was 3,513 mi (5,654 km) long, the longest non-stop airline route in the world at the time. The Liberators flew a shorter 3,077 mi (4,952 km) over-water route from Learmonth to an airfield northeast of Colombo, but they could make the flight in 17 hours with a 5,500 lb (2,495 kg) payload, whereas the Catalinas required 27 hours and had to carry so much auxiliary fuel that their payload was limited to only 1,000 lb (454 kg). The route was named Kangaroo Service and marked the first time that Qantas' now-famous Kangaroo logo was used; passengers received a certificate proclaiming them as members of The Order of the Longest Hop. The Liberators were later replaced by Avro Lancastrians.[28

[dwg]

ORIGINAL: m10bob
Qantas Empire Airways began service with the first of two converted Liberators on the Perth to Colombo route

Emphasis on the converted! They had fuel tanks in the bomb-bay (later moved to the wings).

And Perth-Columbo is small beans compared to the Ismailia, Egypt to Darwin flight of the Wellesleys of the RAF Long range Development Flight in November 1938, not bad on a single engine!