Southwest Airlines is changing its long-standing policy for accommodating passengers who can’t fit in a single seat and they’ll soon have to buy a second adjacent seat to fly.

But passengers could apply for a refund once travel is completed if the flight isn’t fully booked.

The airline posted the new rules on its website last week for plus-sized passengers and they’ll take effect Jan. 27 when other major changes for the airline occurs.

For many years, the Dallas-based airline — the busiest serving Harry Reid International Airport in Las Vegas — allowed large customers needing additional space to purchase two seats for the price of one when the aircraft was not fully booked.

Under new guidelines, the airline is asking passengers to be proactive about their needs and to purchase two seat

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