Awwww yeah, those suckers at the TSA are going to let us take knives on planes again. Pocket knives are the best. Get one. Here are some suggestions—all plane-legal as of April 25th.
Buck Chairman Series Companion
The two-blade craft knife, aka pen knife, is a classic. A larger workhorse blade paired with a smaller one that's great for detail work—like fine whittling or cleaning your nails. I have one like this, and I carry it every day. $33 [Amazon]