Sorry Guys but I'm going against the flow here
The Pocket Oxford dictionary:
Bonus - Something extra, esp. dividend to shareholders, gratuity added to normal pay
Just say thank you and walk away. If you need the money that badly, keep on walking out the door.
BTW, you appear to contradict yourself. The Bonus is based on basic pay and then you talk about adding flying duty pay
And yes, you're completely correct - we should get more.
BUT, it's a
Bonus