I’m flying next to a sky trail!! There it is, an old one starting to spread out, and apart, in the upper atmospheric breeze. There! Our plane just passed under it! So very close. I don’t see any more, only the one. Oh, it’s casting a faint shadow on the ground, too! Now it’s gone; the shadow, so fleeting yet so real. This was my first close encounter with an airplane sky vapor, and I didn’t have my camera ready!