Maybe the military of several countries are not sharing their data in a timely manner because it's embarrassing for them to reveal that they were sleeping on the job, there is no actual intercept plan, and that the millions/billions spent on air defense is a complete waste of money.

http://www.dailymail.co.uk/news/article-2583553/Thai-militar...

"Has there been a military cover-up over missing jet? Thai air force says its radar spotted MH370 heading to Strait of Malacca minutes after it vanished (but didn't say anything)... MH370 spotted at 1.28am, eight minutes after it stopped communicating. Turned towards Butterworth, a Malaysian city along the Strait of Malacca... Thai air force did not report contact because 'it did not look like a threat'"

If I am not mistaken, the 9/11 commission report revealed that civilian and military radar systems and processes were not linked, thereby resulting in confusion as to what was happening. Although lessons should have been learnt, I suspect this problem still exists in many countries, and this is what we are witnessing right now.