Here are three vintage pieces of silverware from Delta Airlines.  I do not know the age of the pieces.  They are Stainless Steel. There are two different style/sizes of knives.  The longer knife measures about 7 7/8 inches long.  It has a large serrate.  The second knife measures about 6 7/8 inches long.  It has some discoloration on the end of the handle near/around the Delta symbol (see picture 12).  It has a large serrate.  The last piece is a teaspoon.  It measures about 5 3/4 inches long.  It is in very good condition.    I will have other Airlines pieces listed.  I will gladly combine shipping.  Please e-mail any questions.