What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

What can you catch but never throw?

People put me on the table and cut me but do not eat me. What am I?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

What has 88 keys?