is it only 45 pound or moor from usa two india by air india?

Answer 1

Here it is, direct from the Air India web site (link below):
Checked Baggage

PIECE SYSTEM

This is applicable on flights to / from USA or Canada, both when the baggage is through checked to / from USA and Canada, and when there is a stopover at an intermediate point). Passengers are entitled to carry two pieces of checked-in luggage as per following specifications:

# First / Executive Class: Two pieces of baggage. Linear dimensions (length+height+width) of each piece should not exceed 158 cm (62 inches). The weight of each bag should not exceed 32 kg (70 lbs)

# Economy Plus and Economy Class: Two pieces. Linear dimension (length+height+width) of both pieces should not exceed 273 cm (107inches). Moreover, the linear dimensions of each piece should not exceed 158 cm (62inches). The weight of each bag must not exceed 23 kg (50 lbs)

Answer 2

Call the Airport.