In applying P$5$F analysis to the airline industry $-$ which would not be a factor for Bargaining Power of Suppliers?

In applying P$5$F analysis to the airline industry $-$ which would not be a factor for Bargaining Power of Suppliers?

Labor $($e$.$g$.$ Cabin Crew, Pilots$)$

Food Snacks $($e$.$g$.$ Peanuts, Soft drinks$)$

Aircraft manufacturers $($e$.$g$.$ Boeing, Airbus$)$

Fuel $($e$.$g$.$ Shell, Exxon$)$

Passengers $($e$.$g$.$ Business, Leisure$)$