I have just purchased tickets to attend a wedding in Dallas the first week of Janurary. Since I am still on leave from Jetblue I can't non-rev (legally anyways). However the tickets were only $188 roundtrip PVD-EWR-DFW-CLE-PVD. The only leg that could be upgraded is the EWR-DFW as it is on a 737. The rest are on the ever wonderful jungle jets. Is it worth it to purchase the upgrade on the EWR-DFW leg?