I'll remain skeptical enough to stop short of saying extraterrestrials beings from another planet are visiting us, but I am positive that something is happening, has been happening for thousands of years and many intelligent, educated and prominent individuals are aware of it.
I know there are 400 individuals right now who have requested immunity from prosecution due to security agreements they have with the government so they can testify before congress about what they know and have seen. I have seen a documentery where 20 of these individuals with no security agreements testified in public about events.
I would lean towards these things being secret military vehicles except that they have been seen well before we had any technology of that sort. They show up in artwork from every era. There is a painting from 1710 showing a flying saucer with three spot lights shining down on the baptism of Jesus.
Any how I thought it was intesting that modern sightings are discounted as clouds and lightning which is exactly what the Bible says the Israelites saw.
Like everything else, time will tell.
PS This is what they were dismissed as seeing:
"That night was a perfect atmospheric condition in terms of low [cloud] ceiling and a lot of airport lights. When the lights shine up into the clouds, sometimes you can see funny things. That's our take on it."