I tried to book a flight with Cheapoair. The price seemed right, a little bit less that the price proposed on Expedia, and the flight time and duration seemed a better option than those offered on other websites. I chose the flight, i give then all my credit information, and before closing the transaction, they changed the price from 2 600 USD to 9 000 with no option to go back or to cancel. I closed the webpage, but seconds after my phone rang and a lady with an indian accent proposed me to look over for another flight. She was finding flight with 15 hours and more layovers, so I said I do not want to continue the conversation. Two day later my credit card was blocked because they tried to charge me the 9 000 dollars.
Conclusion: do not use this company, which seems rather a scam... And not a serious business!