http://klm.com/travel/se_en/travel_i...ance/index.htm
And for "weight concept" destinations (a growing list as of more recently?):
Silver: +5 kg (11 lbs)
Gold: +10 kg (22 lbs)
Platinum: +20 kg (44 lbs)
one of the following sports
equipment up to 20 kg: golf bag,
dive bag, skis or snowboard
For business on India-US/US-India, it's a piece concept and business travel gets more:
2 pieces, each max. 32 kg (70 lbs)
as coach only gets:
2 pieces, each max. 23 kg (50 lbs)
Star Alliance is the best group when it comes to additional luggage allowance for elites.