IATA who are the worldwide trade association for airlines are advising that they reducing the growth predictions to 2% for 2019. This is almost a halving of their previous predictions.
There are a number of reasons for this decline. As will come a s no surprise the China / USA trade dispute initiated by Donald Trump has created a fundamental distortion in the market. Many companies built up stock through 2018 in order to avoid a 25% increase in duty rates into the USA.