Official sources - 40x30x10

🟢Perfect fit as Personal Item

AirAsia

https://support.airasia.com/s/article/What-are-the-rules-for-cabin-baggage-on-board?language=en_GB

Croatia Airlines

https://www.croatiaairlines.com/Baggage/Hand-baggage

Scoot

https://www.flyscoot.com/en/plan/booking-your-flight/baggage

Singapore Airlines

https://www.singaporeair.com/en_UK/my/travel-info/baggage/cabin-baggage/

Vietjet Air

• https://www.vietjetair.com/en/pages/to-have-a-good-flight-1599448842652/baggage-service-1608369253127

• https://www.vietjetair.com/en/pages/luxury-service-1689910019892/business-class-1689909797784

• https://www.vietjetair.com/en/pages/luxury-service-1689910019892/skyboss-1606903571731

🟢Within stated dimensions as Personal Item

Air India

https://www.airindia.com/in/en/travel-information/baggage-guidelines/cabin-baggage.html

Cathay Pacific

https://flights.cathaypacific.com/en_US/baggage/baggage-calculator.html

Jet2

https://www.jet2.com/en/baggage

Philippine Airlines

https://www.philippineairlines.com/my/en/before-you-fly/baggage-information/baggage-allowance/baggage-allowance-fees/carry-on-baggage.html

Ryanair

https://help.ryanair.com/hc/en-gb/categories/12489112419089-Bag-Rules

Transavia

• https://www.transavia.com/help/en-eu/baggage/cabin-baggage/cabin-bag

• https://www.transavia.com/en-EU/conditions/conditions-of-carriage/

Volotea

https://www.volotea.com/en/baggage/

Malaysia Airlines

https://www.malaysiaairlines.com/my/en/travel-info/baggage/cabin-baggage.html

Wizz Air

https://www.wizzair.com/en-gb/help-centre/booking-information-and-services/baggage/baggage-allowance

🟠Likely allowed as Personal Item (no stated dimensions)

All Nippon Airways

• https://www.ana.co.jp/en/us/travel-information/baggage-information/carry-on/

• https://www.ana.co.jp/en/jp/guide/boarding-procedures/baggage/international/carry-on/

Batik Air Malaysia (OD)

https://www.batikair.com.my/experience/baggage

Japan Airlines

• https://www.jal.co.jp/jp/en/inter/baggage/inflight/

• https://www.jal.co.jp/jp/en/dom/baggage/inflight/

Malaysia Airlines

https://www.malaysiaairlines.com/my/en/travel-info/baggage/cabin-baggage.html