Top panel: predicted signal-to-noise ratios (SNRs) for two WIRC transit observations of each F-star planetary system observable from Palomar Observatory after excluding those with published mass-loss detections. Labeled stars indicate our survey targets. The highest-SNR planet is KELT-3 b, which was initially a survey target but was lost to poor weather. Bottom panel: Roche filling factor vs. stellar rotational velocity for all F-star planetary systems observable from Palomar Observatory (purple) and F-star planetary systems with detected outflows (gray). WASP-121 is viewed pole-on, and we therefore plot the minimum equatorial stellar rotational velocity constraint from V. Bourrier et al. (2020) as a horizontal arrow.