This works best in game worlds that are near the end of time (i.e. MT8 right now). Basically, the return button (instead of confirm order) gets borked during the workflow.
1. Select new plane to order (specifically, one you can order more frames than it can allocate production to before the end of time).
2. Make selection as if you're going to order eleventy billion of them (or 50 would do).
3. Get quote - receive the error message you need to make a smaller order.
4. Return to the first page, select a smaller quantity (i.e. one that won't get the error message).
5. Get that quote
6. Realize you want to order as many planes as possible before the end of time, so click Return instead of Confirm
7. Joke's on you - Webpage has expired, return to step 1.
What should happen:
7. Return to the order page, tweak, adjust, requote.
8. If new quote is good, move to 9, else 7.
9. ....
10. Profit