Transport links to the UAE could be set to improve over the coming years thanks to increased investment into the sector.That is according to Markaz, the Kuwait Financial Centre, which recently claimed that the performance of leading Middle Eastern airlines will see the GCC government spend a total of $104 billion on airport expansion.Markaz claimed that the investment will be staggered over the next three years and is pinned on the fact that passenger capacity at Emirates, Qatar Airways and Etihad - the world's three fastest-growing carriers - is expected to quadruple by 2020."By 2015, Dubai, Doha, and Abu Dhabi international airports will have a combined annual capacity of 190 million passengers," the Markaz report said."With 48 million passengers in 2010, Dubai is now the world's fifth largest airport. However, Abu Dhabi and Qatar also aim to attain a hub status for the region."The news comes after a number of airlines, including those from India, Singapore and the Czech Republic have confirmed that they are extending their flight schedules in order to meet demand for flights to and from the UAE.