1920s - 30s vintage original paintings, primitive landscapes, lake w/ early bi-plane

Two old original artworks (oils? painted on stretched canvas) 1920s or 30s, at our guess. The wood frames are roughly period to the paintings, and measure about 20 1/2" x 10 3/4" overall. Neither picture has glass, and both pictures have a few chips and small holes.

We know very little about art, as we can rarely afford it! These came out of an estate in central Wisconsin, and we loved them as once, with the wonderful lake scenes. One of the pictures shows a tiny biplane, too!

We believe these are signed RR Kornberg, but we aren't positive of the signature - we haven't been able to find out anything at all about this artist.