Tried the screenshot method for the first time about three weeks ago and it worked pretty well. While the LM website was showing a TK connection from SIN-IST-EZE, SQ was also available on the SIN-IST sector with a shorter connection in IST. This mixed carrier option wasn't available on the website so I did it the screenshot way. I received a reply 4 hours after the first email, requesting for scans of passports. 12 hours later, I received the itinerary and instructions to call them for payment. Skyped them, using the toll-free USA number, and wrapped it up within 40 minutes. I was transferred to another agent to sort out the payment and, at times, had to be on hold for a few minutes, but otherwise it was hassle-free.