Photoshop or any other image editor could be used, with a little extra work, to produce the dummy airline tickets. They don't have a PNR code and can't be verified on the airline website. It is risky to use a dummy flight ticket as proof of return or even to apply for a visa because dummy tickets are easy to spot.
In order to pass immigration control or file for a visa, you have to b... https://www.onlinedummyticket.com/