There are different types of allowances for West Bengal Govt. employees e.g. Dearness Allowance, House Rent Allowance, Medical Allowance, Compensatory Allowance, Hill Allowance, Spectacle Allowance, etc.
The touring officials, may please check availability of discounted air-tickets, while booking their air tickets for official journeys or check the same from the internet directly for the airlines concerned in case of direct booking.