Original sentence: On 26 June 1940, MAP awarded a contract to Packard to build modified versions of the Rolls-Royce Merlin engines under licence; in September, MAP increased the first production order by 300
Edited sentence: A year later, it flew an escort mission from the UK to Kiel- a distance of 490 miles-to set its first record.In November, 1942, the AAF began extensive modification of the P-51 to accommodate a Rolls-Royce engine.On 26 June 1940, MAP awarded a contract to Packard to build modified versions of the Rolls-Royce Merlin engines under license; in September, MAP increased the first production order by 300.The U.The mustang was designed for the British in 1940 as a substitute for the P-40.Ultimately, the P-51's combat range was extended to 1,800 miles, and before the war's end, it earned its reputation as the world's best escort aircraft.took little interest in the North American-built plane until the mid-1942; then the RAF began comparing it favorably with the spitfire and it showed promise as a long-range escort for the bombers which where flying deeper into the enemy territory in all theaters