If they are indeed going to offer in flight Wifi, I doubt it would provide enough bandwidth for VOIP.
Lufthansa offers in flight Wifi already, and the bandwidth is typically 120 - 160kbps (although they claim that they offer higher bandwidth).
If they use satellite to relay the signal to a ground staion, then you're looking at 500-600ms delays. Given the this, the VOIP quality would be pretty crappy.
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If they are indeed going to offer in flight Wifi, I doubt it would provide enough bandwidth for VOIP.
Lufthansa offers in flight Wifi already, and the bandwidth is typically 120 - 160kbps (although they claim that they offer higher bandwidth). If they use satellite to relay the signal to a ground staion, then you're looking at 500-600ms delays. Given the this, the VOIP quality would be pretty crappy.