Air companies are crazy !

Yesterday my friend told me that an air flight he booked for June was cancelled suddenly, because an airline went bankrupt and cancelled many flights.

"His booking of a flight in June" sounds like he never booked the flight but planned to do so in June.

So he had to book another flight. / to buy another ticket.

I felt that It sounded like a joke, but it was a true story.

I guess that many people are troubled by sudden flight cancellations.

Yesterday an air company in Asia sent me a link and asked me to do an online check-in.

So I tried at midnight, then they asked me to pay more for insurance fees which I did not need it.

But I could not refuse the insurance_ when I booked the ticket.

So I was not happy to pay for it; moreover, I did not have my credit card beside me, so I did not pay and gave up on checking in last night.

Today I tried doing the online check-in one more time with my credit card, then they did not ask to pay the insurance fee any more.

But the PDF has nothing in it.

So, I replied the air company asking them to send my boarding pass again.

But, the e-mail address did not work and I got a “Delivery Status Notification (Failure).” I hope that these things are a joke.

Luckily, I did not delete the website (?), so I could pint out my boarding pass.

What are you trying to say here? You can't delete a website off the internet, unless you own it. It sounds like you had the power to close down the airline's website.

But I don’t have any record of it on my computer.

How much crazy these air companies are!

Airlines are crazy !

Whenever you say "air company" in this entry, you actually want to say "airline" instead.

Yesterday my friend told me that his booked flight in June was suddenly cancelled, because an airline went bankrupt and cancelled many flights.

We would say just "flight", not "air flight" ("flight" already implies that it's in the air). But here "booked flight" would be an even better and more concise way to say what you want.

"Suddenly", an adverb, more commonly comes before "cancelled" (the verb). It sounds a bit better this way.

We say "went bankrupt", not just "bankrupted". If we say "bankrupted", we mean that something is acting on something else - like, "Through his terrible spending habits, her son eventually bankrupted her." (You could also say, "...her son drove her to bankruptcy.")

I thought it was a joke.

You could say "I felt that it sounded like a joke" (with the "like" in there - otherwise it doesn't make real grammatical sense), but this is a shorter and more natural way to say it.

I guess that many people have problems with sudden flight cancellations.

"Troubled by" sounds like it's some deeply worrying thing that hangs around all the time - like an emotional concern, maybe. "Have problems with" is more neutral.

So I tried at midnight. They asked me to pay more for an insurance fee, which I did not need it.

This would be better as two sentences, since the "then..." part is more of a separate idea.

But I could not refuse the insurance, when I booked the ticket.

No comma necessary here.

I didn't want to pay for it, and moreover, I did not have my credit card beside me, so I did not pay and gave up on checking in for the night.

"I didn't want to pay..." is more direct and natural than "I was not happy about paying for it".

You need an "and" between the first two thoughts. When you have an "and" there, then, there's no need for a comma between "moreover" and "I" because "moreover" gets folded into that second idea.

Today I tried doing online check-in one more time with my credit card and they did not ask to pay the insurance fee any more.

Here "and" is better than "then" because the "and" idea is clarifying an aspect of what is happening in the first part. It's not a sequence, like you did one thing and then something else resulted from it.

I’d like to ask them why, and what the difference is between today and yesterday.

A comma helps separate the two ideas here. Otherwise you read "why and what" as one chunk, when "what" is actually introducing a different thought.

But the PDF has nothing in it.

So, I asked the air company to send my boarding pass again.

You want "asked ... to", not "replied to". "Reply to" just means you send a response.

Luckily I did not delete the website, so I could print out my boarding pass.

But I don’t have any records in my computer.

How much crazy these air companies are!

I've lost my faith in these air companies.

A better way of saying what you mean, I think.

Maybe I should not use cheap airlines any more, but their prices is pretty good.

More than one company and more than one price, so "prices".

Maybe I should not use budget airlines any more, but their prices are pretty good.

I’d like to ask them why, what's the difference is between today and yesterday?