S. . Butt, N. . Anjum, and S. . Mahmood, “Sustainability vs. Affordability: How Passengers View Airline Pricing and Sustainability Effort”, AIJSS, vol. 5, no. 3(s8), pp. 187–205, Mar. 2026, doi: 10.63056/academia.5.3(s8).2026.2106.