Northern Pacific Airways had to cancel its second-ever scheduled flight.Bryan Giardinelli/Northern Pacific Airways Northern Pacific Airways launched its first revenue flight between California and Las Vegas on Friday. Despite a successful outbound, the airline had to cancel the return due to a "minor maintenance issue." NPA was initially created to offer low fares between the US and Asia, but its plans have faced unexpected hurdles. Startup airline Northern Pacific Airways is struggling to take off — both figuratively and literally.On Friday, the new discount carrier finally launched its first-ever revenue flight between Ontario, California, and Las Vegas, officially entering the US market — albeit over a month late after delaying the inaugural initially scheduled for June 2.And, it has already faced another hiccup.