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I have to ask why would the stairs be gone? Was there a problem with them regarding safety. It seems to be OK board RJ's by walking out onto the field and up the plane's own stairs. British Airways still do it when their 737 lands in JER, if the weather is good enough. And I remember countless Delta CRJ's being boarded on airstairs. Not to mention BA46's and Dash 800's in the UK on various trips.
Has someone banned airstairs?
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One reason...money!
Delta didn't go anywhere they were needed. Each station either had a jetway or portable air staris for the 1L door. Plus there's always the aft airstairs.
So why drag around several hundred pounds of extra weight equipment you never use? Especially when that extra weight is NOT generating revenue.
Plus if it's on the airplane, it will at one time or another require maintenance and/or inspection. This too takes time, i.e. money.
So just take them off. Although I'd bet they just told Mickey Dee to leave them off the MD88s and MD90s they were buying. That way you don't have to store a few hundred of them. Probably required some FAA paperwork.