I don't know if the 100 mil includes the purchase of the other two companies but if it does, combined with the carbon tax isn't probably as bad as it looks.
Singapore Airlines purchased shares directly from VA in exchange for guaranteed 10% holdings for $105mil (Oct 2012). This was probably part of a deal to fund the acquisition of Tiger and Skywest one would assume. Therefore the purchase of Tiger and Skywest was effectively free, paid for by SQ. The further shares this year were purchased from Virgin group so that money went to Branson.