It's not part of the game at Virgin Domestic, Virgin Regional, Jetstar, Sunstate, or Eastern (not sure about Qantas as their EBA isn't on the AFAP website but I'd be surprised if they didn't have some protections around roster changes). From what I can tell, what they're after is pretty much industry standard.
VIRGIN DOMESTIC.....
DISPLACEMENT FOR OPERATIONAL REASONS
20.1 A pilot may be displaced from a rostered duty for the following reasons:
(a) Flight cancellations;
(b) Checking or training;
(c) Disruptions due to weather or mechanical information; or
(d) Aircraft type change
….
20.5 A pilot who is displaced from duty will only be assigned duty that falls within a period commencing one hour prior to the original sign on time and terminates one hour after the original sign on time at home base, unless such pilot agrees otherwise.
VIRGIN REGIONAL (i.e. SKYWEST EBA).....
13.4 All changes to the roster shall be wholly contained within a buffer period defined by 2 hours either side of the originally rostered duty.
Where a pilot was rostered reserve, allocated a duty and the duty subsequently changes all changes shall be within a buffer period defined by 2 hours either side of the first allocated duty and not the reserve period.
Should a re-assigned duty, displaced reserve and subsequently assigned duty fall outside the above mentioned buffer, then such changes require Pilot approval.
In this instance, all Duty times outside the two hour buffer shall be paid at the applicable Productivity Rate.
This clause does not apply to reserve periods.
JETSTAR.....
2.4 DISPLACEMENT
2.4.1 A pilot may be displaced from a rostered tour of duty for a number of reasons including but not limited to the following:
1. Cancellation of a flight(s) which directly and adversely impacts on their scheduled duty.
2. Published schedule variation
3. Disruption and/or recovery to service due to misconnections
4. Short notice sick leave
5. Publicity
6. Checking, training and courses required by Jetstar
7. Interviews or meetings scheduled arising from performance management issues
8. Duty hour limitations
9. Rest period requirements
10. Issues relating to OH&S
11. Misconnections
12.Management pilots personal proficiency or recency requirements (twenty-four (24) hours’ notice to be given)
….
2.5.1.2 Where a pilot is displaced from their original rostered duty with less than twelve (12) hours (fourteen (14) hours for self-nominated wide body pilots) notice, they may be assigned a duty commencing no earlier than their original rostered sign-on time and/or terminating no later than their original rostered sign-off time plus one (1) hour.
2.5.1.3 Where a re-assignable pilot is notified more than twelve (12) hours (fourteen (14) hours for SNWBP) in advance of their original rostered sign-on time, they may be assigned a duty with a sign-on time no earlier than one (1) hour prior to their original rostered sign-on time and/or a sign-off time no more than one (1) hour later than their original tour of duty rostered sign-off time.
SUNSTATE.....
36.1 It is the intent of this clause that rosters are established to provide stability to pilots in their working environment and that the workload is evenly distributed amongst the pilot group.
Consistent with this, pilots may choose not to accept extra duty or changes to roster.
….
36.19.5 When any change occurs within 48 hours of rostered sign-on and the pilot's sign-on becomes more than two hours earlier than the original rostered sign-on or more than one hour later than the original rostered sign-off times and the pilot agrees to the change the pilot shall be paid $220.
EASTERN.....
41.4.1. Displacement
a) A pilot may be displaced from the pilot's rostered duty period for any of the following reasons:
i. Disruptions to or cancellation of any of the Company's services;
ii. Checking and Training (subject to this Agreement); or,
iii. When the pilot has insufficient hours to complete a flight.
b) A pilot may be displaced before, during or after signing on for duty.
c) A pilot who is displaced under these provisions shall be deemed re-assignable.
d) A pilot who is displaced to re-assignable reserve shall be available for duty within the original duty plus a buffer of one hour prior and two hours after the original rostered duty.