Aljoscha Wendholt (born 17 June 1986), professionally known as Josh Cahill, is a German aviation vlogger, airline critic and blogger who presents airline reviews primarily through his YouTube channel.

Aljoscha Wendholt was born in Nordrhein-Westfalen, Germany. He moved to Saxony when he was six years old, and grew up in the village of Mildenau in Saxony. He started travelling in 2005 with his first trip to Lithuania.

In 2009, after abandoning an attempt to walk 12,000 km from Germany to Shanghai, China, he hitchhiked from Germany to Iran. He visited Afghanistan as a tourist in 2015, as well as North Korea in 2017.

In July 2015, Cahill posted his first flight review on his YouTube channel and has since received over 121 million views. His most-watched review has over 22 million views.

On 22 December 2020, Cahill and other bloggers were on board during the delivery of Uganda Airlines' first Airbus A330-800 from Toulouse to Entebbe; the delivery was led by General Katumba Wamala, the then Ugandan Minister of Works and Transport, and received by Uganda's President Yoweri Museveni.

On 24 February 2021, Cahill organized Afghanistan's first ever all-female flight from Kabul to Herat. The flight was operated by Kam Air and first featured on his channel.

Cahill has received several awards for his work, including the "Best Airline Channel" in 2018, the "Aviation Achievement Award" in 2021, and the "Airline Critic of the Year" in 2024.

In 2018, Cahill, on a Malaysia Airlines flight from Kuala Lumpur to London, shared his criticisms on Instagram during the flight, using the in-flight Wi-Fi. According to Cahill, the crew confronted him for the Instagram post and refused to provide him any more service unless he stopped filming.

On 7 January 2020, Cahill gave a negative review to Singapore Airlines. Someone claiming to be a Singapore Airlines crew member sent him a death threat. Cahill contacted local law enforcement regarding the death threat, who said they would investigate.

In 2020, Cahill flew on board a Tunisair Airbus A330, and shared his criticisms of its lounge and onboard faculties. In 2021, Cahill reviewed Tunisair again, giving another negative review. Upon arrival at Tunis International Airport, he was approached by five police officers over his previous video. They asked him to hand over his camera, which he refused.

In December 2023, Cahill claimed that Qatar Airways tried to bribe him with free flights in exchange for taking down a negative review, and then banned him from the airline after he refused.

In 2024, an Aero Dili staff member made Cahill's passport public, explaining that he had published Cahill's passport to prove that the problems at check-in occurred because the name in Cahill's passport did not match the name on Cahill's boarding pass.