For this year's edition, editors were asked to consider 12 criteria: product rating, safety rating, passenger reviews, fleet age, operating profit, premium economy class, flat beds in business class, investment grade rating, environmental report, industrial issues, serious incidents and innovation.
No other carrier was able to break Air New Zealand's five-year streak, which editors credit to a record-breaking financial performance, in-flight innovations, environmental record, young fleet and motivated staff.
Readers of Conde Nast Traveler also named Air New Zealand the world's best airline last month.
One of the carrier's most popular features is their economy class Skycouch, which can convert a three-seater into a larger lie-flat space for sleeping or relaxing, thanks to an additional fold-out footrest.
The top 10 list, meanwhile, is dominated by carriers in Oceania, Asia and the Middle East, with Qantas and Singapore Airlines rounding out the podium.
Here are some of the winners:
1. Air New Zealand
3. Singapore Airlines
4. Virgin Australia
5. Virgin Atlantic
6. Etihad Airways
7. All Nippon Airways
8. Korean Air
9. Cathay Pacific
10. Japan Airlines
Best Domestic Airline Service, Best Catering and Best Lounges: Qantas
Best First Class and Best Cabin Crew: Singapore Airlines
Best Economy: Korean Air
Best Business Class: Virgin Australia
Best In-Flight Entertainment: Emirates
Best Ultra Low-Cost airline: VietJetAir
Excellence in Long Haul travel
Air Canada (Americas)
Virgin Atlantic (Europe)
Etihad Airways (Middle-East/Africa
Korean Air (Asia/Pacific).
Best Low-Cost Airline