I use Shure SE530 IEMs with push-to-hear microphone for plane travel. I brought those along with my new Beyer DT1350, portable supraaural cans with excellent isolation, on an international flight just this weekend. It was no contest, however. The SE530's were way more isolating and the bass was hearable whereas the DT1350's were hard to hear above the ambient rumble, even when cranked up and clamped with maximum force against my ears. But, apart from air travel, the DT1350's are currently my headphones of choice.
Before the Shure's, I used Ety ER4 on planes, but they were less comfortable as they applied more pressure to the inside of my ear canals and I couldn't wear them for more than an hour or so without discomfort (probably because my ear canals, particularly the right ear, seem to have a sharp bend, and the Ety IEMs seat further in the ear than the Shure's).