their respective Projects.  PLCs are also responsible for making available

a list of required response times for inquiries, including but not

limited to, the following two cases

* a specific number of days to respond to regular reimbursement requests,

and

* a specific number of days to respond to pre-authorization requests.

PLCs are also responsible for monitoring the available balance in their

Project Fund, and for granting or refusing approval for travel expense 

requests based on an assesment of the funds available and of any 

outstanding contracts payable.  PLCs are not to approve travel expense 

requests when their Project does not have sufficient funds to cover the 

expense.  If a PLC has any questions regarding whether their Project has 

sufficient funds to cover a Traveler's expense request, the PLC should 

contact Conservancy.

== Transportation

=== Overall transportation Cost

Domestic transportation costs greater than US$750 requires Conservancy 

approval prior to booking, even if all other Policy conditions have been 

Conservancy approval prior to booking, even if all other Policy conditions 

have been met.

=== Advance Purchase

Tickets for travel by air or rail (excluding commuter train and subway) 

should be booked at least 14 days in advance; any travel booked less than 

14 days in advance requires written pre-authorization by Conservancy.  

Tickets for travel by air or rail beyond 365 days in advance also require 

written pre-authorization by Conservancy.

=== Air Travel

==== Class of Service

Coach and/or Economy Airfare is the only acceptable class for all flights

(domestic and international) unless a PLC provides a special exception and

a valid reason (such as a need for business class due to a documented

medical reason) to Conservancy for written approval.  Travelers may select

their airline of choice (e.g., for the purpose of collecting airline miles

and rewards), provided that the resulting air fare otherwise meets the

requirements of this Policy.  Travelers should not book out-of-Policy trips

(and thus pay a higher fare) in order to qualify for a mileage upgrade.