June 26 (Reuters) - Southwest Airlines on Wednesday revised its second-quarter forecast for revenue per available seat miles (RASM), a proxy for pricing power, citing uneven travel demand.

The airline now expects current quarter RASM to be down between 4% to 4.5%, compared with its previous estimate of a fall of 1.5% to 3.5%. (Reporting by Shivansh Tiwary in Bengaluru; Editing by Shailesh Kuber)