I take it there are no international standards regarding the type or size of font that airlines must use for their reg's?
Some of the North American airlines are the worst offenders with reg's which are almost impossible to read from 150-200 metres (AA being the absolute worst!). Also, is there no requirement to show the reg on the underside of the wing? I was staying in London back in June and was under the flightpath into Heathrow but couldn't ID most of the US stuff cos they'd no reg displayed under the wing though I think Lufty don't display underwing either?