I tried shaving with one of a pack of cheap supermarket brand single blade disposables (10 for £2 I think) a few days back. With cream and the plastic Wilkinson sword brush (£3.50 so no tears if something happens to it) it worked remarkably well. I haven't had to fly since I switched to the DE but I'll definitely be packing a few of these disposables the next time I can't take a DE with me.
I haven't used the same disposable more than once but given how cheap they are and how heavy my beard is, I'd expect to toss it after a couple of shaves.
Razors: English Gillette Tech
Cream: TOBS Shaving Shop, Proraso
Soap: TOBS Sandalwood, Wilkinson Sword
AS - "Noir", Old Spice
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