How can I online stream from my iPad Air to an older model Viera TV without Apple TV? How can I connect my iPad Air to an older Panasonic Viera TC-L37e3 to stream a YouTube video? What app do I need, if any?  Can I use a HDMI adaptor?
I take a glance at Panasonic Viera TC-L37e3 manual and as I understood it has DLNA feature. Have you try to use it? Because there are several streaming apps for iPad working with DLNA devices (Infuse, nPlayer, ArkMC, VLC). They give you a possibility to wirelessly connect your iPad and TV.
The only problem is if they work with Youtube videos. I definitely know that ArkMC streams Youtube videos, but what about others, I doubt.