Kourtney Kardashian and Travis Barker travel to mountain retreat on

Kourtney Kardashian and Travis Barker travel to mountain retreat on commercial flight

Kourtney Kardashian and Travis Barker are traveling on a commercial flight… after sister Kylie Jenner was criticized for her carbon footprint

Kourtney Kardashian, 41, and Travis Barker, 46, were recently spotted doing a promotional flight.

The celebrity couple kept a low profile as they boarded an Alaska Airlines flight from Los Angeles to Spokane, Washington last week.

Kourtney’s daughter Penelope, 10, and cousin North West, 9, were reportedly traveling with them.

Commercial: Kourtney Kardashian, 41, and Travis Barker, 46, were recently spotted courting

Commercial: Kourtney Kardashian, 41, and Travis Barker, 46, were recently spotted courting

Witnesses say the group wore masks and hoodies during the flight.

There is speculation that the couple could spend some time at their home in Coeur d’Alene, Idaho, which is about 30 miles away.

The group appeared to maintain a low-key presence, donning masks and hoodies.

Low profile: The celebrity couple kept a low profile as they boarded an Alaska Airlines flight from Los Angeles to Spokane, Washington last week

Low profile: The celebrity couple kept a low profile as they boarded an Alaska Airlines flight from Los Angeles to Spokane, Washington last week

The decision to travel with the crowds comes as Kourtney’s younger sisters, Kim, 41, Kylie Jenner, 24, and her partner Travis Scott, 31, have been blasted over the carbon footprint of using private jets.

Kim came seventh on the list compiled by marketing firm Yard.

The group calculated that it was responsible for 4268.5 tons of CO2 emissions on 57 flights.

Family time: Kourtney's daughter Penelope, 10, and cousin North West, 9, were reportedly out with them

Family time: Kourtney’s daughter Penelope, 10, and cousin North West, 9, were reportedly out with them

Low-key: The group appeared to maintain a low-key presence throughout the flight

Low-key: The group appeared to maintain a low-key presence throughout the flight

The TKN rapper was No. 10, causing 3,033.3 tons of CO2 emissions in an average air travel of just seven point three miles that year alone, the shortest average among the top 10.

The Kylie Cosmetics founder didn’t make the top ten list despite her flights lasting an average of 24 minutes.

As vegans, Kourtney and Travis already have a lower carbon footprint. According to Shrink That Footprint, the average vegan diet produces half the emissions of the Standard American Diet and a third of the greenhouse gases produced by a meat-heavy diet like keto.

Fundday on Sunday: The Poosh founder shared a short video as she waterskied on a boogie board in a lake with clear blue water and pine-covered mountains in the background

Fundday on Sunday: The Poosh founder shared a short video as she waterskied on a boogie board in a lake with clear blue water and pine-covered mountains in the background

Pink: The Kardashians star donned a bright pink long-sleeved one-piece suit and safety vest for her trip around the lake Fun in the Sun: 'Sunday Funday!!'  She wrote on the clip

Pink: The Kardashians star donned a bright pink long-sleeved one-piece suit and safety vest for her trip around the lake

The Blink 182 drummer put together his own Kravis Guide to Eating Vegan in LA, which can be found on Kourtney’s Poosh website.

The Kravis squad seemed to be enjoying their rural getaway. On Sunday, Kourtney posted a short video as she waterskied on a boogie board in a lake with clear blue water and pine-covered mountains in the background.

The Kardashians star donned a bright pink long-sleeved one-piece suit and safety vest for her trip around the lake, and wrote “Sunday Funday!!”. in their Instagram Stories.

Taking flights: The decision to travel with the crowds comes as Kourtney's younger sisters Kim, 41, and Kylie Jenner, 24, have been blasted over the carbon footprint of using private jets

Taking flights: The decision to travel with the crowds comes as Kourtney’s younger sisters Kim, 41, and Kylie Jenner, 24, have been blasted over the carbon footprint of using private jets