> But the OP-1 is literally the only piece of music gear you can bring on an airplane and write a whole song.
Apart from the several other great options mentioned in other replies, there’s also the Dirtywave M8. It, and the other tracker-style devices like the Polyend, actually make it much easier to write proper songs than the OP-1’s finnicky and unforgiving tape-based recording interface. (I own all these devices and have used them extensively.)
But if you are really serious about writing music on a plane just use a laptop and a modern DAW.
Apart from the several other great options mentioned in other replies, there’s also the Dirtywave M8. It, and the other tracker-style devices like the Polyend, actually make it much easier to write proper songs than the OP-1’s finnicky and unforgiving tape-based recording interface. (I own all these devices and have used them extensively.)
But if you are really serious about writing music on a plane just use a laptop and a modern DAW.