The government on Tuesday said it has received 141 proposals from airlines and chopper companies to operate flight services under the second round of air regional connectivity -- Udan scheme -- that aims to connect unserved and under-served airports.According to Civil Aviation Minister Ashok Gajapati Raju, 17 applicants, including airline and chopper companies, have sent their proposals for a total of 502 routes in the second phase of the scheme.The government is expected to award the air routes by the latter part of December 2017.In the first phase, contracts to five companies were awarded to operate flight services on 128 routes to 70 airports.