The Sony WH-1000XM4 headphones are very similar to the predecessors, not been to a single airport, and so haven't been able to test this.
Sony WH-1000XM4 headphones review: The noise-canceling king
Dual noise sensor technology, featuring two microphones on each earcup, captures ambient noise and passes the data to the HD Noise-Canceling Processor
Sony WH1000XM4/B Premium Noise Cancelling Wireless Over-The-Ear Headphones with Built in Microphone Black Bundle with Deco Gear Hard Case + Pro Audio
No Longer the King of Noise-Cancelling? Bose QC35ii Review
The Walkman Blog: The best just got better - Sony announces the WH-1000XM4
Sony WH-1000XM4 review: the best noise-canceling headphones get better - The Verge
Sony WH-1000XM4 Wireless Premium Noise Canceling Overhead Headphones with Mic for Phone-Call and Alexa Voice Control, Black WH1000XM4 : Electronics
Sony's new 1000XM4 headphones have improved noise cancellation and can pair with two devices at once - The Verge
Sony WH-1000XM4 Wireless Noise Cancelling headphones Review : Dethroning its predecessor to become the new ANC King
Sony WH-1000XM4 review: Bose-beating noise cancelling headphones, Headphones
Sony WH-1000XM4 Review - the KING of noise cancellation!
Sony WH-1000XM4 Review The Best Headphones Got Better
Sony WH-1000XM4 Review - The King Gets Subtle Improvements –
Sony WH-1000XM4 review: Bose-beating noise cancelling headphones, Headphones
Sony WH-1000XM4 review: the best noise-canceling headphones get better - The Verge
Best Noise Cancelling Headphones: Sony WH-1000XM4 Review – SheGeeks