I have the Brother 1043D. It does not have air threaders. I think it is still available and there is one similar with a different number and color. I watched a tutorial on how to thread it. It isn't hard. It works well for me. It's on Amazon for $199 so it is probably around that price elsewhere. It has differential feed. Also, use the search function because we have discussed sergers before. I know the air threaders are very popular but, they are very spendy. Mine works fine for me.