Pooley Costumes & Caps LLC $("$PC & C$")$ is a large props company formed in $1957,$ and Fast Flags Corporation is a small, local flag manufacturer formed in $2018.$ These two businesses never had any dealings with each other until they recently entered into a contract, with terms all drafted by PC & C$.$ The contract provides that PC & C shall purchase $1,000$ flags that Fast Flags will specially design for PC & C$.$ The contract further provides that PC & C has the right to initiate, on a weekly basis, purchase orders of up to $100$ flags until the contract's total number of flag purchases $-1,000$ flags $-$ has been reached. Also, the contract includes a clause stating that PC & C can cancel its obligation to pay for the remaining flags at any time if any Fast Flags shipment does not arrive on the exact day as stated in a particular purchase order; this last provision is included in the contract even though time was of little importance to PC & C$.$

The first shipment of $100$ flags arrives a day late, and PC & C decides to cancel the entire remainder of flags due, leaving Fast Flags with $900$ flags displaying a PC & C logo$.$ Fast Flags does not have a secondary market in which to sell these flags and decides to offer these flags to PC & $C$ at $30\%$ of the initial price. What is Fast Flags' best claim to enforce the original contract?