Two Japanese airports were among the world's most punctual in 2015, while the nation's two primary air carriers were ranked among the top five airlines, OAG Aviation Worldwide Ltd. says in its annual Punctuality League report.

The report, released Wednesday by U.K.-based aviation intelligence company, said Tokyo's Haneda airport was the most punctual, with 91.25 percent of flights arriving or departing on time. That was enough to take it past Germany's Munich Airport, winner of the 2014 survey.

For a flight to be considered on time, it must arrive or take off no later than 15 minutes from its originally scheduled time, according to OAG.

The punctuality list for small airports meanwhile saw Itami airport in Osaka top the rankings with a 93.85 percent on-time performance record, with Copenhagen Airport leading all mid-size airports.

In the airline category, Japan Airlines Co., with a score of 90.44 percent, and All Nippon Airways Co., with a score of 89.65 percent, surged to take fourth and fifth places, respectively, in the punctuality rankings behind Latvia's airBaltic, which was the top performing airline with 94.39 percent.

In 2014, JAL was ranked ninth and ANA 15th.

OAG said the scores were based on over 50 million flights in 2015.

The report said airports and airlines both improved overall compared with the previous year thanks to increased spending on technology and greater efforts to improve.