There were signs of green shoots for the airline industry last month, as air-traffic figures showed signs of improvement. But the head of the International Air Transport Association (IATA) said yesterday that it didn’t mean a recovery was imminent. Passenger demand in April fell 3.1 per cent year-on-year, a massive improvement on March’s 11.1 per cent drop. But IATA warned that the figures were skewed by the late-falling Easter holiday, which would have boosted numbers by at least two per cent. It also said that preliminary data for May showed a return to double-digit decline.